22. ionization for 1.2 Msolution of hydeofuoric acid given that the Ka for (18 p

Question

22. ionization for 1.2 Msolution of hydeofuoric acid given that the Ka for (18 points) is 1AN ph pOn HF P1 TH'1 Percent order kinetics with a rate 23. The decomposition of an insecticide in water follows 1* constant of 1.62 yr at 20°C. If a sample of water at 20°C contains this insecticide and has a concentration of 5.23 x 10+ moles/L, a) what will the concentration be one year from now? b) how long will it take for the concentration of the insecticide to decrease to 2.11 x 104 moles/L (12 points)?

Explanation / Answer

(23)

Using the first order decay equation:

A = A0*e-kt

Data given:

A0 = 0.000523

k = 1.62 yr-1

Putting values:

A = 0.000523*e-1.62*1

Solving we get:

A = 1.035*10-4 M

(b)

Putting values:

0.000211 = 0.000523*e-1.62*t

Solving we get:

t = 0.56 years

Hope this helps !

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