endpoint was reached after adding 20 mL of sodium hydroxide solution NaOH(aq) to 20 mL of sulfuric acid H2SO4 The solution had a concentration of 1.50 mol/L

Question

What was the initial concentration of sulfuric acid

Select one:

a. 

1.50 mol/L

b. 

0.75 mol/L

c. 

2.25 mol/L

d. 

3 mol/L

Answer 1

Hi Elle W.,

Let's assume the solution given as data is the sodium hydroxide. Then, since sulfuric acid is a diprotic acid 9has 2 protons per molecule that may be released), it only takes half as many moles of H2SO4 (the two volumes being equal) to neutralize the stated amount of sodium hydroxide. So ... what's half of 1.50 ? Don't forget your units!

-- Cheers, --Mr. d.