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borishaifa [10]
3 years ago
7

Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4.

Chemistry
1 answer:
Lostsunrise [7]3 years ago
5 0

Answer: pH of solution is = 1.82

Explanation:

HNO_2\rightarrow H^+NO_2^-

 cM              0             0

c-c\alpha        c\alpha          c\alpha  

So dissociation constant will be:

K_a=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.500 M and \alpha = ?

K_a=4.6\times 10^{-4}

Putting in the values we get:

4.6\times 10^{-4}=\frac{(0.500\times \alpha)^2}{(0.500-0.500\times \alpha)}

(\alpha)=0.030

[H^+]=c\times \alpha

[H^+]=0.500\times 0.030=0.015

Also pH=-log[H^+]

pH=-log[0.015]=1.82

Thus pH of a 0.500 M HNO_2 solution is 1.82

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