# Math Help - chemm homework

1. ## chemm homework

sorry i know this isnt math but i m really stuck..

can someone help!

you have 1.00mL of a 6.00M phosphoric acid solution and 2.00mL of a 3.00M sodium hydroxide solution. what is the empirical formula and theoretical weight??

2. Empirical formula and theoretical weight of what? The resultant salt?

$\text{H}_{3}\text{PO}_{4} + 3 \text{NaOH} \rightarrow \text{Na}_{3}\text{PO}_{4} + 3 \text{H}_{2}\text{O}$

This is a result of the 3 hydroxide ions reacting with the 3 hydrogen ions of phosphoric acid as we are dealing with an acid-base reaction. The details of this are probably aren't important at this stage but this is the reaction.

So find the limiting reagent and calculate the amount of resultant salt from there.

3. Originally Posted by o_O
Empirical formula and theoretical weight of what? The resultant salt?

$\text{H}_{3}\text{PO}_{4} + 3 \text{NaOH} \rightarrow \text{Na}_{3}\text{PO}_{4} + 3 \text{H}_{2}\text{O}$

This is a result of the 3 hydroxide ions reacting with the 3 hydrogen ions of phosphoric acid as we are dealing with an acid-base reaction. The details of this are probably aren't important at this stage but this is the reaction.

So find the limiting reagent and calculate the amount of resultant salt from there.

so the resulting salt is just a trisoduim phosphatE?

4. Just sodium phosphate. No need for the prefix. And there are the water molecules as well.