Thread: Need help calculating change in pH

I need to figure out how to calculate the change in pH when 6.00 mL of .100 M HCl (aq) is added to a 100 mL of a buffer solution that is .10 M in NH3 (aq) and .10 M in NH4Cl (aq). Also I need to calculate the change in pH when 6.00 mL of 0.10 M Na)H (aq) is added to the original buffer solution. I have tried several ways to do this and haven't gotten in correct so explanation of steps would be great. Thanks

Keep all your units the same during calculations

Originally Posted by nsr7

I need to figure out how to calculate the change in pH when 6.00 mL of .100 M HCl (aq) is added to a 100 mL of a buffer solution that is .10 M in NH3 (aq) and .10 M in NH4Cl (aq). Also I need to calculate the change in pH when 6.00 mL of 0.10 M Na)H (aq) is added to the original buffer solution. I have tried several ways to do this and haven't gotten in correct so explanation of steps would be great. Thanks

I got 2.059 for the first one and 1.080 for the second one. It's my homework to learn to use this speciation program; so, I thought I'd plug in your variables and see if I got it right. If you can, post your answers when you get them. I would like to compare.

GOOD LUCK ON YOUR HOMEWORK!