Question

If you mix 125mL of 3M HCl and 145mL of 3M CO3-2 , what is the pH?
is it 9.6?

Answer 1

ph = -log[H+]

Answer 2

So you are diluting the strong acid

Answer 3

I guess this is a buffer solution you will want to use Henderson–Hasselbalch equation most likely

Answer 4

https://www.khanacademy.org/science/chemistry/acids-and-bases/v/buffers-and-hendersen-hasselbalch

This will probably explain how to perform the calculation adequately, if it doesn't I can help you with it

Answer 5

First thing you want to do is recalculate the concentration of each solution though taking into account that you diluted both of them by putting them together

Answer 6

125+145 = 270mL final volume

Answer 7

CO3 -2 is a strong base right?

Answer 8

No

Answer 9

It is a weak base

Answer 10

The CO3-2 reacts with water to form hydroxide ions, it isn't 100% ionized

Answer 11

CO3-2 + H2O -> HCO3- + -OH

Answer 12

I dont know how advanced your course is but you can either ignore the carbonate completely or you can use the Henderson–Hasselbalch equation

Answer 13

Thank you, that is what I did, I used the Henderson–Hasselbalch equation for the CO3 and HCO3 species