1. Farmers who raise cotton onve used arsenic acid, H3AsO4, as a defoliant at harvest time....

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Chemistry

1. Farmers who raise cotton onve used arsenic acid, H3AsO4, as adefoliant at harvest time. Arsenic acid is a polyprotic acid withK₁ = 2.5 * 10^-14, K₂ = 5.6 * 10^-8 , and K₃ = 3 * 10 ^-13 .
What is the pH of a 0.500 M sol'n of arsenic acid?
answer ) 1.96
3. A solution is prepared by adding 0.10 mol ofKCH₃COO, to 1.00 L of water.
Which statement about the sol'n is correct?
a) the sol'n is basic.
b)the sol'n is neutral
c) the sol'n is acidic
d) the concentrations of K⁺ ions andCH₃COO^- ions will be identical
e) the concetnration of CH₃COO^- ions willbe greater than the concetnraion of K⁺ ions.
4. A sol'n is prepared by adding 0.10 mol of KCL, to 1.00 L ofwater. Which statement about the sol'n is correct?
a) the sol'n is basic
b) the sol'n is neutral
c) the sol'n is acidic
d)one need to know the temperature before any of the abovepredictions can be made.
e) the values for Ka and Kb for the species in sol'n must beknown before a prediction can be made.
I already knew the answers except #2, but I don't know thereason why.
Please explain the questions to me. Thanks!

Answer & Explanation Solved by verified expert

3.7 Ratings (489 Votes)

1answer 1Arsenic is polyprotic which means it can go throughdifferenttitrations In this problem we are only worried aboutarsenic acidthis means we use K1 If we were using H2AsO4 See Answer

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