1. What is a buffered solution? 2. Write a NET IONIC equation to show the reacti

Question

1. What is a buffered solution?

2. Write a NET IONIC equation to show the reaction of HCl with a 3-1 buffer of Acetate to Acetic Acid, Write a similar equation for the reaction of NaOH with the buffer.

3. Twenty drops make about 1 milliliter. Use this to calculate:

a. The pH of a solution after 3 drops 6 M HCl are added to 50 mL H2O.
b. The pH of a solution after 3 drops 6 M HCl are added to 50 mL buffer that has [HAc] = 0.100M and [Ac-] = 0.300M.   

4. Discuss why a relatively insoluble acid will dissolve more easily as it is being titrated (That is - as NaOH is added).

5. Explain why it is not necessary to precisely measure the volume of water that is used to dissolve the solid acid that is to be titrated.

Explanation / Answer

Ans 1.

A buffer solution is an aqueous solution that is made up of a weak acid and its conjugate base . It resists any change in pH when any strong base or acid is added into it . It is used to keep pH nearly constant in wide variety of chemical reactions and procedures. It is also present in our body ( bicarbonate buffering system ) that resists the change in pH of blood.

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