Question

1. Rank the following 0.100 M solutions in terms of increasing pH:

HCl(aq), H₂O(l), NaOH(aq) < NaF, (aq), and H₂CO₃.

2. The pH of a solution at the phenolphthalein end point is 9.0. For which type of titration could you use phenolphthalein as an indicator?

Select one:

a. Titrations of strong acids only.

b. Titration of all strong and most weak acids.

c. Titrations of weak bases only.

d. Titrations of weak acids only.

e. All titrations of strong or weak acids or bases.

3. 4.199 g of NaF(s) are dissolved in water and poured quantitatively into a 50.00 mL volumetric flask which is filled to the line with DI water and mixed well. 20.00 mL of this solution is pipetted into a 100 mL volumetric flask which is filled with DI water and mixed well. 25.00 mL of this solution is pipetted into a 100 mL volumetric flask which is filled with DI water and mixed. What is the [NaF] in this final solution?

Select one:

a. 0.2000 M

b. 0.1000 M

c. 0.04000 M

d. 0.2500 M

e. 1.000x10^-4 M