chemistry 1046

posted by .

A.Determine the pH of the solution.

a solution that is 1.17% HCl by mass (Assume a density of 1.01 g/mL for the solution.)

B. Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 279 mg/L.

  • chemistry 1046 -

    A.
    1.17% by mass means 1.17g HCl/100 g soln.
    mols HCl = grams/molar mass
    Convert 100 g to mL using density.
    Then M = mols/L

    B. To save typing let's call amphetamine BNH2. M BNH2 = 0.279/molar mass = ?
    ..........BNH2 + HOH ==> BNH3^+ + OH^-
    I.........?..............0.........0
    C........-x..............x.........x
    E.........?-x.............x.........x

    Substitute from the ICE chart into the Kb expression for amphetamine and solve for x = OH^-, then convert that to pH.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. College Chemistry

    Amphetamine (C9H13N) is a weak base with a pKb of 4.2. Calculate the pH of a solution containing an amphetamine concentration of 215 mg/L. I calculated the molarity as 1.58*10^-3 and the Ka as 1.58*10^-10. I did ICE and i got the pH …
  2. chemistry

    Q.1 What will be the pH at the equivalence point during the titration of a 100 ml 0.2M solution of CH3COONa with 0.2M of solution of HCl?
  3. chemistry

    1. if 15.0mL of 4.5 M NaOH are diluted with water to a volume of 500mL, what is the molarity of the resulting solution?
  4. chemistry

    2- A 0.310 M solution of a weak acid, HX, has a pH of 2.53 a. Find the [H+] and the percent ionization of nitrous acid in this solution. b. Write the equilibrium expression and calculate the value of Ka for the weak acid. c. Calculate …
  5. Chemistry

    i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 …
  6. Chemistry

    i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 …
  7. Chemistry

    i. Which of the following solutions has the lowest pH (more acidic). Explain you answers. a. a 0.1 M solution of a strong acid or a 0.1 M solution of a weak acid. b. a 0.1 M solution of an acid with Ka=2×10-3 or one with Ka=8×10-6 …
  8. Science-Chemistry

    Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH …
  9. Chemistry

    A) Determine the pH of a 0.98 x 10^-2 mol L solution of hydrocyanic acid (HCN) Ka = 4.0 x 10^-10 B) What is the pH of a 0.243mol L solution of methylamine?
  10. Chemistry

    Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH …

More Similar Questions