Visualizing buffers You can visualize a buffer solution containing approximately

Question

Visualizing buffers

You can visualize a buffer solution containing approximately equal concentrations of HA and A? in action using the following equation, where Ka is the equilibrium constant:

Ka[H3O+]==[H3O+][A?][HA]Ka[HA][A?]

When the concentrations of HA and A? are relatively large, the addition of a small amount of acid or base changes their concentration negligibly. The result is that the ratio[HA]/[A?] maintains a value approximately equal to 1, and the [H3O+] is approximately equal to the Ka value under buffer conditions.

Part A

Calculate the pH of the solution made by adding 0.50mol of HOBr and 0.30 mol of KOBr to 1.00 L of water. The value of Ka for HOBr is 2.0

Explanation / Answer

Ka = 2.0x10-9

2.0x10-9 = ((0.30+x)(x))/(0.50-x)

Solve for X.

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