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July 3, 2015

Homework Help: Chemistry

Posted by Brittany Rusk on Friday, September 22, 2006 at 5:06pm.

q1.

The label on an antacid remedy states that each tablet contains 750 mg of aluminum hydroxide. Calculate the volume of stomach acid, 0.10 mol/L HCl(aq), which can be nuetralized by one antacid tablet.

Q2.
Compare equivalence point to endpoint


q1.

The label on an antacid remedy states that each tablet contains 750 mg of aluminum hydroxide. Calculate the volume of stomach acid, 0.10 mol/L HCl(aq), which can be nuetralized by one antacid tablet.
Al(OH)3 + 3HCl ==? 3H2O + AlCl3
The remainder of this problem is worked the same as the NaOH/H2SO4 problem I solve for you in your last post. Don't forget to change 750 mg to g and I assume you know mols = g/molar mass.


Q2.
Compare equivalence point to endpoint

The equivalence point is the point (in an acid/base titration) where what we are titrating is the same as the titrant being added (best described in terms of number of equivalents of one equal to number of equivalents of the other but equivalents and normality are not being taught at many schools now, much to my sorrow). The end point is the point at which an indicator TELLS us we have reached that point; hence the name end point. We try to pick indicators that have an end point that is the same as the equivalence point but usually that can't be done. However, with the judicious choice of indicators, we can usually keep the titration error to a very small number. There are equivalence points for other titrations as well as acid/base; the only difference is that we aren't measuring pH.

I hope this helps.

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