diff --git a/extensions/TeX/mhchem3/mhchem.js b/extensions/TeX/mhchem3/mhchem.js
index b5c3e3562..55d1af1f0 100644
--- a/extensions/TeX/mhchem3/mhchem.js
+++ b/extensions/TeX/mhchem3/mhchem.js
@@ -22,11 +22,11 @@
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */
-MathJax.Extension["TeX/mhchem"]={version:"3.0.6"},MathJax.Hub.Register.StartupHook("TeX Jax Ready",
+MathJax.Extension["TeX/mhchem"]={version:"3.2.0"},MathJax.Hub.Register.StartupHook("TeX Jax Ready",
 function(){var n=MathJax.InputJax.TeX,r=MathJax.Object.Subclass({string:"",Init:
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+function(n,r){if(!n)return n;void 0===r&&(r="ce");var o="0",e={};e.pL=0,n=n.replace(/[\u2212\u2013\u2014\u2010]/g,"-"),n=n.replace(/[\u2026]/g,"...");for(var a,u,i=[];;){a!==n?(u=10,a=n):u--;var s=t.c[r],l=s.e.length;n:for(var h=0;h<l;h++){var p=s.e[h],c=p.g[o]||p.g["*"]||null;if(c){var f=t.h(p.h,n);if(f){for(var m=t.j([],c.k),k=m.length,d=0;d<k;d++){var g,q=m[d],v=void 0;if(q.l&&(v=q.m,q=q.l),"string"==typeof q)if(s.g[q])g=s.g[q](e,f.h,v);else{if(!t.g[q])throw["MhchemBugA","mhchem bug A. Please report. ("+q+")"];g=t.g[q](e,f.h,v)}else"function"==typeof q&&(g=q(e,f.h));i=t.j(i,g)}if(o=c.n||o,!(n.length>0))return i;if(c.s||(n=f.t),!c.u)break n}}}if(u<=0)throw["MhchemBugU","mhchem bug U. Please report."]}},
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+function(n){if(n.match(/^\([a-z]+\)$/))return null;var r=n.match(/^(?:[a-z]|(?:[0-9\ \+\-\,\.\(\)]+[a-z])+[0-9\ \+\-\,\.\(\)]*|(?:[a-z][0-9\ \+\-\,\.\(\)]+)+[a-z]?)$/);return r?{h:r[0],t:n.substr(r[0].length)}:null},"%z":/^(?:pH|pOH|pC|pK|iPr|iBu)(?=$|[^a-zA-Z])/,"/":/^\s*(\/)\s*/,"//":/^\s*(\/\/)\s*/,"*":/^\s*\*\s*/,"@W":
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+function(n,r){var o=t.w[n];if(void 0===o)throw["MhchemBugP","mhchem bug P. Please report. ("+n+")"];if("function"==typeof o)return t.w[n](r);var e=r.match(o);if(e){var a;return a=e[2]?[e[1],e[2]]:e[1]?e[1]:e[0],{h:a,t:r.substr(e[0].length)}}return null},t.g={"a=":
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 function(n,r){return{l:"~G",p1:t.go(r[0]),p2:t.go(r[1])}},
 "~X":
@@ -285,7 +281,7 @@ function(n,r,t){return{l:"~Q",A:t||r}},
 "%m":
 function(n,r){return{l:"%Q"}},
 "~T":
-function(n,r){var o,a=t.h("%A",n.d||"");a&&""===a.t&&(n.d=a.h);var e=t.h("%A",n.q||"");e&&""===e.t&&(n.q=e.h),n.d&&(n.d=n.d.replace(/\u00B0C|\^oC|\^{o}C/g,"{}^{\\circ}C"),n.d=n.d.replace(/\u00B0F|\^oF|\^{o}F/g,"{}^{\\circ}F")),n.q?(n.d=t.go(n.d,"pu"),n.q=n.q.replace(/\u00B0C|\^oC|\^{o}C/g,"{}^{\\circ}C"),n.q=n.q.replace(/\u00B0F|\^oF|\^{o}F/g,"{}^{\\circ}F"),n.q=t.go(n.q,"pu"),"//"===n.o?o={l:"%S",p1:n.d,p2:n.q}:(o=n.d,o=n.d.length>1||n.q.length>1?t.j(o,{l:"%V"}):t.j(o,{l:"/"}),o=t.j(o,n.q))):o=t.go(n.d,"%R");for(var u in n)delete n[u];return o}}},
+function(n,r){var o,e=t.h("%A",n.d||"");e&&""===e.t&&(n.d=e.h);var a=t.h("%A",n.q||"");a&&""===a.t&&(n.q=a.h),n.d&&(n.d=n.d.replace(/\u00B0C|\^oC|\^{o}C/g,"{}^{\\circ}C"),n.d=n.d.replace(/\u00B0F|\^oF|\^{o}F/g,"{}^{\\circ}F")),n.q?(n.d=t.go(n.d,"pu"),n.q=n.q.replace(/\u00B0C|\^oC|\^{o}C/g,"{}^{\\circ}C"),n.q=n.q.replace(/\u00B0F|\^oF|\^{o}F/g,"{}^{\\circ}F"),n.q=t.go(n.q,"pu"),"//"===n.o?o={l:"%S",p1:n.d,p2:n.q}:(o=n.d,o=n.d.length>1||n.q.length>1?t.j(o,{l:"%V"}):t.j(o,{l:"/"}),o=t.j(o,n.q))):o=t.go(n.d,"%R");for(var u in n)delete n[u];return o}}},
 t.c["%R"]={e:t.C({"~C":{"*":{k:"~T"}},
 "*":{"*":{k:["~T","%N"],n:"0"}},
 "@E":{"*":{k:"%c"},n:"1"},"%m":{"*":{k:["~T","%m"],n:"0"}},
@@ -297,15 +293,15 @@ function(n,r){return{l:"%O"}},
 function(n,r){n.rm+="^{"+r+"}"},"%m":
 function(n,r){return{l:"ah"}},
 "~T":
-function(n,r){var o;if(n.rm){var a=t.h("%A",n.rm||"");o=a&&""===a.t?t.go(a.h,"pu"):{l:"rm",p1:n.rm}}for(var e in n)delete n[e];return o}}},
+function(n,r){var o;if(n.rm){var e=t.h("%A",n.rm||"");o=e&&""===e.t?t.go(e.h,"pu"):{l:"rm",p1:n.rm}}for(var a in n)delete n[a];return o}}},
 t.c["%X"]={e:t.C({"~C":{0:{k:"~U"},o:{k:"~V"}},
 ",":{0:{k:["~U","~q"],n:"o"}},
 ".":{0:{k:["~U","~s"],n:"o"}},
 "~A":{"*":{k:"%t"}}}),g:{"~q":
 function(n,r){return{l:"~r"}},
 "~U":
-function(n,r){var t=[];if(n.text.length>4){var o=n.text.length%3;0===o&&(o=3);for(var a=n.text.length-3;a>0;a-=3)t.push(n.text.substr(a,3)),t.push({l:"%W"});t.push(n.text.substr(0,o)),t.reverse()}else t.push(n.text);for(var e in n)delete n[e];return t},"~V":
-function(n,r){var t=[];if(n.text.length>4){for(var o=n.text.length-3,a=0;a<o;a+=3)t.push(n.text.substr(a,3)),t.push({l:"%W"});t.push(n.text.substr(a))}else t.push(n.text);for(var e in n)delete n[e];return t}}};var o={H:{"~h":
+function(n,r){var t=[];if(n.text.length>4){var o=n.text.length%3;0===o&&(o=3);for(var e=n.text.length-3;e>0;e-=3)t.push(n.text.substr(e,3)),t.push({l:"%W"});t.push(n.text.substr(0,o)),t.reverse()}else t.push(n.text);for(var a in n)delete n[a];return t},"~V":
+function(n,r){var t=[];if(n.text.length>4){for(var o=n.text.length-3,e=0;e<o;e+=3)t.push(n.text.substr(e,3)),t.push({l:"%W"});t.push(n.text.substr(e))}else t.push(n.text);for(var a in n)delete n[a];return t}}};var o={H:{"~h":
 function(n){var r="";return n.a=o.go2(n.a),n.b=o.go2(n.b),n.p=o.go2(n.p),n.o=o.go2(n.o),n.q=o.go2(n.q),n.d=o.go2(n.d),n.a&&(n.a.match(/^[+\-]/)&&(n.a="{"+n.a+"}"),r+=n.a+"\\,"),(n.b||n.p)&&(r+="{\\vphantom{X}}",r+="^{\\hphantom{"+(n.b||"")+"}}_{\\hphantom{"+(n.p||"")+"}}",r+="{\\vphantom{X}}",r+="^{\\smash[t]{\\vphantom{2}}\\llap{"+(n.b||"")+"}}",r+="_{\\vphantom{2}\\llap{\\smash[t]{"+(n.p||"")+"}}}"),n.o&&(n.o.match(/^[+\-]/)&&(n.o="{"+n.o+"}"),r+=n.o),"kv"===n["%I"]?((n.d||n.q)&&(r+="{\\vphantom{X}}"),n.d&&(r+="^{"+n.d+"}"),n.q&&(r+="_{\\smash[t]{"+n.q+"}}")):"~Y"===n["%I"]?(n.d&&(r+="{\\vphantom{X}}",r+="^{"+n.d+"}"),n.q&&(r+="{\\vphantom{X}}",r+="_{\\smash[t]{"+n.q+"}}")):(n.q&&(r+="{\\vphantom{X}}",r+="_{\\smash[t]{"+n.q+"}}"),n.d&&(r+="{\\vphantom{X}}",r+="^{"+n.d+"}")),r},rm:
 function(n){return"\\mathrm{"+n.p1+"}"},"%s":
 function(n){return n.p1.match(/[\^_]/)?(n.p1=n.p1.replace(" ","~").replace("-","\\text{-}"),"\\mathrm{"+n.p1+"}"):"\\text{"+n.p1+"}"},"%d":
@@ -324,8 +320,8 @@ function(n){return"{\\color{"+n.F+"}{"+o.go2(n.G)+"}}"},"~l":
 function(n){return"\\color{"+n.B+"}"},"~b":
 function(n){n.rd=o.go2(n.rd),n.rq=o.go2(n.rq);var r=o.J[n.r];return n.rd||n.rq?"<=>"===n.r||"<=>>"===n.r||"<<=>"===n.r||"<-->"===n.r?(r="\\long"+r,n.rd&&(r="\\overset{"+n.rd+"}{"+r+"}"),n.rq&&(r="\\underset{\\lower7mu{"+n.rq+"}}{"+r+"}"),r=" {}\\mathrel{"+r+"}{} "):(n.rq&&(r+="[{"+n.rq+"}]"),r+="{"+n.rd+"}",r=" {}\\mathrel{\\x"+r+"}{} "):r=" {}\\mathrel{\\long"+r+"}{} ",r},"~Q":
 function(n){return o.K[n.A]}},
-J:{"->":"rightarrow","\u2192":"rightarrow","\u27f6":"rightarrow","<-":"leftarrow","<->":"leftrightarrow","<-->":"leftrightarrows","<=>":"rightleftharpoons","\u21cc":"rightleftharpoons","<=>>":"Rightleftharpoons","<<=>":"Leftrightharpoons"},I:{"-":"{-}",1:"{-}","=":"{=}",2:"{=}","#":"{\\equiv}",3:"{\\equiv}","~":"{\\tripledash}","~-":"{\\rlap{\\lower.1em{-}}\\raise.1em{\\tripledash}}","~=":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{\\tripledash}}-}","~--":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{\\tripledash}}-}","-~-":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{-}}\\tripledash}","...":"{{\\cdot}{\\cdot}{\\cdot}}","....":"{{\\cdot}{\\cdot}{\\cdot}{\\cdot}}","->":"{\\rightarrow}","<-":"{\\leftarrow}","<":"{<}",">":"{>}"},L:{"%m":" ","~D":"~","%Q":"~",ah:"\\mkern3mu ","%W":"\\mkern2mu ","~r":"{,}","~n":"{{0}}\\mkern6mu ","~o":"{{0}}\\mkern3mu ","~p":"{{0}}\\mkern1mu ","~I":"\\text{-}","~~":"\\,{\\cdot}\\,","~y":"\\mkern1mu \\bullet\\mkern1mu ","@n":"{\\times}","%%":"\\prime ","%N":"\\cdot ","%O":"\\mkern1mu{\\cdot}\\mkern1mu ","%P":"\\times ","~i":"{\\sim}","^":"uparrow",v:"downarrow","~z":"\\ldots ",aa:"\\mathrm{p}K_{\\mathrm{{0}}}",Ka:"K_{\\mathrm{{0}}}",af:"\\mathrm{p}K_{\\mathrm{{0}_{{1}}}}",ag:"K_{\\mathrm{{0}_{{1}}}}","/":"/","%V":"\\,/\\,",al:"{0} "},K:{"+":" {}+{} ","-":" {}-{} ","=":" {}={} ","<":" {}<{} ",">":" {}>{} ","<<":" {}\\ll{} ",">>":" {}\\gg{} ","\\pm":" {}\\pm{} ","\\approx":" {}\\approx{} ","$\\approx$":" {}\\approx{} ",v:" \\downarrow{} ","(v)":" \\downarrow{} ","^":" \\uparrow{} ","(^)":" \\uparrow{} "},go:
-function(n,r){if(!n)return n;for(var t="",o=!1,a=0;a<n.length;a++){var e=n[a];if("string"==typeof e)t+=e;else if(this.H[e.l])t+=this.H[e.l](e);else{if(!this.L[e.l])throw["MhchemBugT","mhchem bug T. Please report."];var u=this.L[e.l];u=u.replace("{0}",e.p1||""),u=u.replace("{1}",e.p2||""),t+=u,"al"===e.l&&(o=!0)}}return r||o||(t="{"+t+"}"),t},go2:
+J:{"->":"rightarrow","\u2192":"rightarrow","\u27f6":"rightarrow","<-":"leftarrow","<->":"leftrightarrow","<-->":"leftrightarrows","<=>":"rightleftharpoons","\u21cc":"rightleftharpoons","<=>>":"Rightleftharpoons","<<=>":"Leftrightharpoons"},I:{"-":"{-}",1:"{-}","=":"{=}",2:"{=}","#":"{\\equiv}",3:"{\\equiv}","~":"{\\tripledash}","~-":"{\\rlap{\\lower.1em{-}}\\raise.1em{\\tripledash}}","~=":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{\\tripledash}}-}","~--":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{\\tripledash}}-}","-~-":"{\\rlap{\\lower.2em{-}}\\rlap{\\raise.2em{-}}\\tripledash}","...":"{{\\cdot}{\\cdot}{\\cdot}}","....":"{{\\cdot}{\\cdot}{\\cdot}{\\cdot}}","->":"{\\rightarrow}","<-":"{\\leftarrow}","<":"{<}",">":"{>}"},L:{"%m":" ","~D":"~","%Q":"~",ah:"\\mkern3mu ","%W":"\\mkern2mu ","~r":"{,}","~n":"{{0}}\\mkern6mu ","~o":"{{0}}\\mkern3mu ","~p":"{{0}}\\mkern1mu ","~I":"\\text{-}","~~":"\\,{\\cdot}\\,","~y":"\\mkern1mu \\bullet\\mkern1mu ","@n":"{\\times}","%%":"\\prime ","%N":"\\cdot ","%O":"\\mkern1mu{\\cdot}\\mkern1mu ","%P":"\\times ","~i":"{\\sim}","^":"uparrow",v:"downarrow","~z":"\\ldots ","/":"/","%V":"\\,/\\,",al:"{0} "},K:{"+":" {}+{} ","-":" {}-{} ","=":" {}={} ","<":" {}<{} ",">":" {}>{} ","<<":" {}\\ll{} ",">>":" {}\\gg{} ","\\pm":" {}\\pm{} ","\\approx":" {}\\approx{} ","$\\approx$":" {}\\approx{} ",v:" \\downarrow{} ","(v)":" \\downarrow{} ","^":" \\uparrow{} ","(^)":" \\uparrow{} "},go:
+function(n,r){if(!n)return n;for(var t="",o=!1,e=0;e<n.length;e++){var a=n[e];if("string"==typeof a)t+=a;else if(this.H[a.l])t+=this.H[a.l](a);else{if(!this.L[a.l])throw["MhchemBugT","mhchem bug T. Please report."];var u=this.L[a.l];u=u.replace("{0}",a.p1||""),u=u.replace("{1}",a.p2||""),t+=u,"al"===a.l&&(o=!0)}}return r||o||(t="{"+t+"}"),t},go2:
 function(n){return this.go(n,!0)}};MathJax.Extension["TeX/mhchem"].CE=r,n.Definitions.Add({macros:{ce:"CE",pu:"PU",xleftrightarrow:["Extension","AMSmath"],xrightleftharpoons:["Extension","AMSmath"],xRightleftharpoons:["Extension","AMSmath"],xLeftrightharpoons:["Extension","AMSmath"],longrightleftharpoons:["Macro","\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}"],longRightleftharpoons:["Macro","\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{\\leftharpoondown}}"],longLeftrightharpoons:["Macro","\\stackrel{\\textstyle\\vphantom{{-}}{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}"],longleftrightarrows:["Macro","\\stackrel{\\longrightarrow}{\\smash{\\longleftarrow}\\Rule{0px}{.25em}{0px}}"],tripledash:["Macro","\\vphantom{-}\\raise2mu{\\kern2mu\\tiny\\text{-}\\kern1mu\\text{-}\\kern1mu\\text{-}\\kern2mu}"]}},
 null,!0),MathJax.Extension["TeX/AMSmath"]||n.Definitions.Add({macros:{xrightarrow:["Extension","AMSmath"],xleftarrow:["Extension","AMSmath"]}},
 null,!0),MathJax.Hub.Register.StartupHook("TeX AMSmath Ready",
diff --git a/unpacked/extensions/TeX/mhchem3/mhchem.js b/unpacked/extensions/TeX/mhchem3/mhchem.js
index 8a1c83a71..de20c17cc 100644
--- a/unpacked/extensions/TeX/mhchem3/mhchem.js
+++ b/unpacked/extensions/TeX/mhchem3/mhchem.js
@@ -3,7 +3,7 @@
 
 /*************************************************************
  *
- *  MathJax/extensions/TeX/mhchem3/mhchem.js
+ *  MathJax/extensions/TeX/mhchem.js
  *
  *  Implements the \ce command for handling chemical formulas
  *  from the mhchem LaTeX package.
@@ -33,7 +33,7 @@
 
 
 MathJax.Extension["TeX/mhchem"] = {
-  version: "3.0.6"
+  version: "3.2.0"
 };
 
 MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
@@ -341,16 +341,6 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
       return null;
     },
     'uprightEntities': /^(?:pH|pOH|pC|pK|iPr|iBu)(?=$|[^a-zA-Z])/,
-    'pK(a)': /^pK([abw]|eq|sp)(?=$|[^a-zA-Z0-9])/,  // acid/base dissociation constant, freezing/boiling-point depression, ionic product for water, equilibrium constants
-    'pK_(a)': /^pK_([abw])/,
-    'pK_{(a)}': /^pK_{([abw]|eq|sp)}/,
-    'pK(a1)': /^pK([ab])([123])(?=$|[^a-zA-Z0-9])/,
-    'pK_{(a1)}': /^pK_{([ab])([123])}/,
-    'K(a)': /^K([abwfcp]|eq|sp)(?=$|[^a-zA-Z0-9])/,
-    'K_(a)': /^K_([abwfcpCP])/,
-    'K_{(a)}': /^K_{([abwfcpCP]|eq|sp)}/,
-    'K(a1)': /^K([ab])([123])(?=$|[^a-zA-Z0-9])/,
-    'K_{(a1)}': /^K_{([ab])([123])}/,
     '/': /^\s*(\/)\s*/,
     '//': /^\s*(\/\/)\s*/,
     '*': /^\s*\*\s*/,
@@ -557,14 +547,6 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
         'rd': { action: 'rqt=', nextState: 'rdt' } },
       'arrowUpDown': {
         '0|1|2|as': { action: [ 'sb=false', 'output', 'operator' ], nextState: '1' } },
-      'pK(a)|pK_(a)|pK_{(a)}': {
-        '0|1|2': { action: [ { type: 'output', option: 1 }, { type: 'insert+p1', option: 'pKa' } ], nextState: '1' } },
-      'K(a)|K_(a)|K_{(a)}': {
-        '0|1|2': { action: [ { type: 'output', option: 1 }, { type: 'insert+p1', option: 'Ka' } ], nextState: '1' } },
-      'pK(a1)|pK_{(a1)}': {
-        '0|1|2': { action: [ { type: 'output', option: 1 }, { type: 'insert+p1+p2', option: 'pKa1' } ], nextState: '1' } },
-      'K(a1)|K_{(a1)}': {
-        '0|1|2': { action: [ { type: 'output', option: 1 }, { type: 'insert+p1+p2', option: 'Ka1' } ], nextState: '1' } },
       'uprightEntities': {
         '0|1|2': { action: [ 'o=', 'output' ], nextState: '1' } },
       'orbital': {
@@ -1571,10 +1553,6 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
       '^': "uparrow",
       'v': "downarrow",
       'ellipsis': "\\ldots ",
-      'pKa': "\\mathrm{p}K_{\\mathrm{{0}}}",
-      'Ka': "K_{\\mathrm{{0}}}",
-      'pKa1': "\\mathrm{p}K_{\\mathrm{{0}_{{1}}}}",
-      'Ka1': "K_{\\mathrm{{0}_{{1}}}}",
       '/': "/",
       ' / ': "\\,/\\,",
       '1st-level escape': "{0} "  // &, \\\\, \\hline
@@ -1712,4 +1690,4 @@ MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
 
 });
 
-MathJax.Ajax.loadComplete("[mhchem]/mhchem.js");
+MathJax.Ajax.loadComplete("[mhchem]/unpacked/mhchem.js");