At the equivalence point of a strong acid-strong base titration, which species a

Question

At the equivalence point of a strong acid-strong base titration, which species are typically present? a weakly acidic cation, a weakly basic anion, and water a weakly acidic cation, a non-basic anion, and water a non-acidic cation, a weakly basic anion, and water a non-acidic cation, a non-basic anion, and water All of these are equally possible. Lead pipes were used at one time for delivering drinking water. What is the maximum possible concentration of lead in this water if it comes from lead(II) hydroxide (K_sp = 2.8 times 10^-16) dissolving from the surface of the pipes'? Note that the EPA limit on lead in drinking water is 7.2 times 10^-8 M. 4.1 times 10^-6M 1.6 times 10^8 M 6.5 times 10^-6 M 5.1 times 10^-6M 8.3 times 10^9 M Stalactites - the long, icicle-like formations that hang from the ceilings of caves - are formed from recrystallizing minerals like calcite (calcium carbonate). The K_sp of calcium carbonate is 4.5 times 10^-9. What is the minimum volume of dripping water saturated with calcium carbonate that would be required to form a small stalactite that had a mass of 1.000 kg? 1.4 times 10^6 L 1.5 times 10^5 L 4.5 times 10^9 L 4.5 times 10^4 L 1.5 times 10^4L

Explanation / Answer

Q60

if strong acid/base... then there will be H2O and Salt production, with pH = 7 approx, so

in the equivalance point, expect only:

ignore all "weakly" since these are strong acid/bases

the best answer is D

since we will have a non-acidic cation ( i.e. will not hydrolyse) and a non-basic anion...plus water

Q61

Max. concentration of Lead

Ksp = 2.8*10^-16

Ksp = [Pb+2][OH-]^2

Assume

(S) to be the solubility so

Ksp = (S)(2S)^2

4*S^3 = Ksp

S = (Ksp)/4^(1/3)

S = ((2.8*10^-16)/4)^(1/3) = 4.1212*10^-6 M

limit willl be over, choose A

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