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# Another buffer solution - practicing exam questions - need help watch

1. 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.
2. (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
3. I get 4.23.

But I reserve the right to withdraw my answer, if proven incorrect, on the grounds that I am sleepy.
4. (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
5. Huzzah.
6. (Original post by Pigster)
Huzzah.
(Original post by charco)
I make it pH 4.23

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