A 0.980 M Nitrous Acid (HNO2) solution has been mixed with 0.050 M NaCl. What wi
ID: 484789 • Letter: A
Question
A 0.980 M Nitrous Acid (HNO2) solution has been mixed with 0.050 M NaCl. What will be the hydronium ion concentration of this solution? The activity coefficients for H3O+ and NO2 are 0.86 and 0.80 respectively. The Ka for Nitrous Acid is 5.10000×10-4. A 0.980 M Nitrous Acid (HNO2) solution has been mixed with 0.050 M NaCl. What will be the hydronium ion concentration of this solution? The activity coefficients for H3O+ and NO2 are 0.86 and 0.80 respectively. The Ka for Nitrous Acid is 5.10000×10-4.Explanation / Answer
HNO2 ----> H+ + NO2-
0.98 0 0
0.98-x x x
Ka = x^2 / 0.98-x = 5.1*10^-4
x^2 + 5.1*10^-4x - 0.0004998 = 0
x = 0.022
Activity = Activity coefficient *Concentration
0.022 = 0.86*Concentration
Concentration = 0.0255
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