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You have to prepare a ph 3.50 buffer, and you have the following 0.10M solutions available:...

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Chemistry

You have to prepare a ph 3.50 buffer, and you have the following0.10M solutions available: HCOOH, CH3COOH,H3PO4,HCOONa, CH3COONa,and NAH2PO4. Which solutions would you use? How many milliliters ofeach solution would you use to make approximately a liter of thebuffer?

The answer on the textbook is 360mL of 0.10M HCOONa and 630mL of0.10M HCOOH. I just need to know how did they get that answer.

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