# A #38.74*mL# volume of #0.50*mol*L^-1# sodium hydroxide solution reaches a stoichiometric endpoint with #19.37xx10^-3*mol# of sulfuric acid dissolve in #50.0*mL# of solution. What is the concentration with respect to #"sulfuric acid"#?

##### 1 Answer

#### Answer:

The first step (AS ALWAYS) is to write a stoichiometric equation......and I think your friend is right.

#### Explanation:

This is an acid base reaction, and as you know sulfuric acid is diprotic. And this is probably the source of the confusion: do I divide by 2; or do I multiply? We have all made these sorts of mistakes.

Given the stoichiometric equation, there were

And thus

Note that normally we would titrate a volume of