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Confused!!!

Hi, I'm really confused about diprotic acids.
I am doing a titration to work out the equilibrium constant, Ihave worked out the moles of acid at equilibrium (0.9) . I knowI need to minus the number of moles of HCL which is 0.3moles however I’ve beentold differently as to whether or not I need to multiply this by two as it is diprotic.Could someone please help me J

Reply 1

Borek

What are you trying to calculate? And what data do you have?

Reply 2

Picture~Perfect

When you have a diprotic acid, you have double the number of hydrogen ions, this is important to remember when calculating moles, depending on the calculation you are doing you may have to multiply or divide by two in order to get the correct answer.

Edit; As pointed out below, HCL is not a diprotic acid so you shouldn't need to do anything different.
Diprotic acids are: Sulphuric acid (H2S04) and carbonic acid (H2CO3)