## Question 12.27

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

Dan_Jin_1K
Posts: 15
Joined: Wed Sep 21, 2016 2:59 pm

### Question 12.27

Hey everyone!

Can someone offer me an explanation on how to do this problem?

A careless laboratory technician wants to prepare 200.0 mL of a 0.025 m HCl(aq) solution, but uses a 250.0-mL volumetric ask by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solution as prepared?

Thanks!

Emily Wang 1H
Posts: 26
Joined: Sat Jul 09, 2016 3:00 am
Been upvoted: 1 time

### Re: Question 12.27

We can find the number of moles of HCl given what the concentration and volume should have been. However the technician put it in a different volume, which would change the molarity. Now, we can find the pH of both since we can find out the concentration of both.