# Chemistry

posted by .

The Ksp for PbF2 is 7.1 x 10 to the(-7). The Kb for the F- anion is 1.4 x 10 to the(-11). A student weighs out 2.5 g of PbF2, places it into 100mL of deionized water and stirs.
a) Will there be any solid PbF2, left in the flask?
b) What is the pH of the solution?

• Chemistry -

PbF2 ==> Pb^+2 + 2F^-
Ksp = (Pb^+2)(F^-)
Set up an ICE chart and solve for solubility PbF2 and for F^-.
Use F^- in the equation below for pH.

F^- + HOH ==> HF + OH^-
Kb = (HF)(OH^-)/(F^-).
Set up ICE chart and solve for OH^-, convert to pOH, then to pH.

For part a), from the solubility of PbF2, (which is in M or moles/L), take a tenth to determine the amount that will dissolve in 100 mL, and compare with 2.5 grams.

## Similar Questions

1. ### Chemistry!

Calculate the solubility of Ag2CrO4 in grams/100mL of water?
2. ### Chemistry

If PbF2 is poured into a solution of 0.012 molar F-, how much will dissolve at equilibrium?
3. ### Chemistry

The Ksp for PbF2 is 7.1 x 10 to the(-7). The Kb for the F- anion is 1.4 x 10 to the(-11). A student weighs out 2.5 g of PbF2, places it into 100mL of deionized water and stirs. a) Will there be any solid PbF2, left in the flask?
4. ### Chemistry

I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this …

I have test procedure to evaluate the clarity of a sodium hydroxide (NaOH) sample that goes like this: Dissolve 10g of NaOH in carbon dioxide free water and dilute to 100ml with the same solvent. Please explain how to perform this …
6. ### chemistry

what are the equilibrium concentrations of Pb2+ and F- in a saturated solution of lead (II)flouride if the Ksp for PbF2 is 3.2*10^-8?
7. ### chemistry

A student is performing an experiment to find the density of water. She obtains a 100ml beaker, which weighs 53.257 grams, and she fills it with 60 mL of water. The temperature of the water is 25.5 degrees celsius (room temperature). …
8. ### chemistry

What is the specific heat of an object that weighs 25 g and when heated to a temp of 500K and dropped into 100mL of water changes the temp of the water from room temp (293K) to 306K?
9. ### chemistry

Several reactions are carried out using AgBr, a cream-colored silver salt for which the value of the solubility product constant, Ksp, is 5.0 x 10-13 at 298 K. a) Calculate the value of [Ag+] in 50.0 mL of a saturated solution of AgBr …
10. ### Chemistry

Explain why the solubility of PbF2 is pH dependent, but the solubility of PbCl2 is not. I know the solubility of PbF2 is pH dependent because the solubility would increase as the solution becomes more acidic because the F^- ion is …

More Similar Questions