How many moles of Na2Co3 would be needed to react with 500 mL of 0.350 M H2SO4 solution?
Na2Co3 + H2SO4-- Na2SO4 + CO2 + H2O

To solve this problem answer these questions:

1. How many moles of Na2Co3 are needed to react with 1 mole of H2SO4 according to THIS equation? Hint: according to your equation one molecule of Na2Co3 would react with one molecule H2SO4.

2. How many moles of pure H2SO4 are contained in 500 mL of 0.350 M solution of H2SO4?

After you answer these simple questions, you solve the problem.

Determine how many grams of KCl must be weighed to prepare 500 mL of a 2.5 molar KCl solution