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Another buffer solution - practicing exam questions - need help

An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.
Original post by Pepper111
An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.


What have you tried?

I get a pH of 4.87
Reply 2
I get 4.23.

But I reserve the right to withdraw my answer, if proven incorrect, on the grounds that I am sleepy.
Original post by Pepper111
An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.


I make it pH 4.23
Reply 4
Huzzah.
Original post by Pigster
Huzzah.


Original post by charco
I make it pH 4.23


Yeah I can't add...

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