Chem II

posted by .

Calculate the pH of the solution made by mixing 35.0 mL of 0.500 M ca(OH)2 with 45.0 mL of 0.710 MHCl

  • Chem II -

    Ca(OH)2 + 2HCl ==> CaCl2 + 2H2O

    mols Ca(OH)2 = M x L = 0.500M x 0.035L = 0.0175 mols.
    mols HCl = M x L = 0.710M x 0.045L = 0.03195

    Since the reaction is 1 mol Ca(OH)2 to 2 mols HCl, that means if all the Ca(OH)2 reacts, it will require 0.0175 x (2 mol HCl/1 mol Ca(OH)2) = 0.0175 x 2/1 = 0.035 mols HCl and we don't have that much; therefore, the HCl is the limiting reagent, all of it will react, and some of the Ca(OH)2 will remain behind unreacted. How much will that be.
    We do the reverse calculation for HCl.
    0.03195 mols HCl x (1 mol Ca(OH)2/2 mols HCl) = 0.01598 mols Ca(OH)2 required. So how much is left.
    0.01750-0.01598 = 0.00153 mols Ca(OH)2.
    What is the volume will we have.
    35.0 mL + 45.0 mL = 80.0 mL = 0.080 L so
    [Ca(OH)2] = 0.00153/0.080 = 0.01906 M. Since there are two OH^- per Ca(OH)2 molecule, (OH^-) is twice that or 0.01906 x 2 = ??
    pOH form that.
    pH from that.
    Post your work if you get stuck.
    Check my arithmetic. These numbers all look alike on my keyboard.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. ap chem

    i am stuck on this problem from school A solution is made by mixing 30.0 mL of toluene C6H5CH3d=0.867gmL with 130.0 mL of benzene C6H6d=0.874gmL . Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the …
  2. chem

    A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0867gmL with 150.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are ____M and _____m.
  3. Chemistry

    A solution is made by mixing exactly 500 mL of 0.178 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.
  4. General Chem

    What do you call a solution that is maid by mixing solid Na2S2O3 5H20 with NaOH?
  5. Chem 2

    A solution is made by mixing 47.0 mL of ethanol, C2H6O, and 53.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C?
  6. AP Chemistry

    A solution is made by mixing exactly 500 mL of 0.167 M NaOH with exactly 500 mL of 0.100 M CH3COOH. Calculate the equilibrium concentrations of H+, CH3COOH, CH3COO-, OH-, and Na+.
  7. Chemistry

    A solution is made by mixing 500 ml of 0.172 M NaOh with exactly 500 ml of 0.100 M CH3COOH. Calculate the equilibrium concentration of the species below. Ka of CH3COOH is 1.8 x10^-5 [H+]=?
  8. Grade 11 Chemistry

    calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride
  9. Chemistry

    calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride
  10. chem

    Calculate the equilibrium concentration of NH3,Cu^2+,[ Cu(NH3)]^2+ ,[Cu(NH3)2]^2+,[Cu(NH3)3]^2+,and[Cu(NH3)4]^2+ in a solution made by mixing 500.0 ml of 3.00 M NH3 with 500.0 ml of 2.00*10^-3 M Cu(NO3)2. The sequential equilibria …

More Similar Questions