Question

In: Chemistry

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

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

Expert Solution

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

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

I 0.500 0 0

C -x +x +x

E (0.500-x) x 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

queen_honey_blossom answered 2 years ago

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