how many ml of a 0.10M NaOH solution are needed to neutralize 15 ml of 0.20 M H3PPO4 solution?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

This is a neutralization reaction between phosphoric acid and sodium hydroxide.

First write a balanced chemical equation:

3 NaOH + H3PO4 --> Na3PO4 + 3 HOH

note that it takes 3 moles of base to completely neutralize the acid.

Now you are starting with 15 mL of 0.2 M acid solution.

mL * M = millimoles

So you have 3 millimoles of acid in solution.

Based on the chemical equation, you need 9 millimoles of base.

9 = 0.1 * mL

9/.1 = 90 mL of NaOH needed

Approved by eNotes Editorial Team

Posted on

Soaring plane image

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial