Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4. 1.82 1.67 2.67 0.30

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Chemistry

Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2is 4.6 * 10-4.
1.82
1.67
2.67
0.30

Answer & Explanation Solved by verified expert

4.3 Ratings (911 Votes)

Write the reaction of HNO2 with water and set up the ICE

Â Â Â Â Â Â Â Â Â Â Â HNO2 (aq) + H2O (l)Â Â Â ---- > NO2- (aq) + H3O + (aq)

IÂ Â Â Â Â Â Â 0.500Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x

EÂ Â Â Â Â Â Â Â (0.500-x)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â x

Use ka expression to find the value of x

Ka = 4.6 x 10^-4 = x²/ ( 0.500-x)

Solve quadratic equation.

X² = 4.5 x 10^-4 ( 0.500-x)

x = 0.01478 = [H3O+]

we know pH = - log [H3O+]

therefore

pH = - log ( 0.01478)

= 1.82

So the pH = 1.82

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Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4. 1.82 1.67 2.67 0.30

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90.2K

Verified Solution

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Chemistry

Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2is 4.6 * 10-4.
1.82
1.67
2.67
0.30

Answer & Explanation Solved by verified expert

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Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2 is 4.6 * 10-4. 1.82 1.67 2.67 0.30

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Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2is 4.6 * 10-4.1.821.672.670.30

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Determine the pH of a 0.500 M HNO2 solution. Ka of HNO2is 4.6 * 10-4.
1.82
1.67
2.67
0.30