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Acids and bases

Please can anybody help me with the following question?

I don't understand how to answer it

1.

Methanoic acid, HCOOH, has a Ka value of 1.58 x 10-4 moldm-3. What ratio of methanoic acid and sodium methanoate would give a buffer of pH = 4?



Thanks in advance
Original post by 786:)
Please can anybody help me with the following question?

I don't understand how to answer it

1.

Methanoic acid, HCOOH, has a Ka value of 1.58 x 10-4 moldm-3. What ratio of methanoic acid and sodium methanoate would give a buffer of pH = 4?



Thanks in advance


You need to know how to do buffer calculations. Here's a video link that shows you ...

[video="youtube_share;jfQDD-U8Jnc"]http://youtu.be/jfQDD-U8Jnc[/video]

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