chemistry

10). What is the molarity of an HCl solution if 42.5 mL of a 0.110 M KOH solution is needed to titrate a 25.0-mL sample of the acid?
A) 0.187 M HCl
B) 0.587 M HCl
C) 0.0647 M HCl
D) 5.35 M HCl
E) 1.70 M HCl

  1. 👍
  2. 👎
  3. 👁
  1. from the equation

    HCl + KOH -> KCl + H2O

    1 mole of HCl reacts with 1 mole of KOH

    Then if we use

    M1V1=M2V2

    42.5 ml x 0.110 M = 25.0 ml x X

    X=42.5 ml x 0.110 ml/25.0 ml

    [Incidently you can use 'school boy logic' here to eliminate amswers. If we only have 25.0 ml and we are titrating against 42.5 ml of 0.110 M then the 25.0 ml solution must be stronger (higher molarity) than 0.110 M. so it can't be (C).
    As the ratio of volumes is 42.5 to 25.0 then we expect the answer to be about 1.5 times more concentrated than 0.110 M, not
    (B) which is 5x
    (D) is 50x and
    (E) is 17x,
    so the answer is (A) without touching a calculator]

    1. 👍
    2. 👎
  2. 0.80 M

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    The pH of a solution prepared by mixing 45 mL of 0.183 M KOH and 65 mL of 0.145 M HCl is i solved it but my answer is wrong. the right one is 1.97. am i missing a step? moles of HCl left over = (moles of HCl) – ( moles of KOH)

  2. chemistry

    The following data were collected at the endpoint of a titration performed to find the molarity of an HCl solution: Volume of acid (HCl) used = 14.4 mL; Volume of base (NaOH) used = 22.4 mL; Molarity of standard base (NaOH) =

  3. chemistry

    If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu]

  4. chemistry

    You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M HCl for tomorrow's undergraduate experiment. In the stockroom explorer, you will find a cabinet called "Stock Solutions".

  1. chemistry

    commercially available concentrated Hydrochloric acid is 37.0% w/w Hcl.its density is 1.18g/ml.using this information calculate (a)the molarity of concentrated Hcl,and (b)the mass and volume (in ml)of solution containing 0.315 mol

  2. Chemistry

    A titration setup was used to determine the unknown molar concentration of a solution of NaOH. A .025 M HCl solution was used as the titration standard. The following data were collected. Trial 1 Trial 2 Trial 3 Initial NaOH Buret

  3. Chemistry

    Problem Description: You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M HCl for tomorrow's undergraduate experiment. In the stockroom explorer, you will find a cabinet

  4. chemistry

    commercially available concentrated hydrochloric acid is 37.0% w/w HCl. Its density is 1.18 g/mL. Using this information calculate (a) the molarity of concentrated HCl, and (b) the mass and volume (in mL) of solution containing

  1. chemistry

    What is the molarity of a solution that contains 31.0 HCl in 5.00kg water? (molar mass of HCl=36.46 g/mol)

  2. Chemistry

    Hi, I posted yesterday with this lab question. "Calculate the molar amounts of NaOH used in the reaction with the HCl solution and with the HC2H3O2. I think I got the answer to that with the help that I received. I had 5 mL of

  3. Chemistry

    Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) If 2.00 g of Mg reacts completely with 50.0 mL of HCl solution, what is the molarity of the HCl solution?

  4. chemistry

    Find the molar masses of the following compounds: 1. LiI 2. PbCO4 3. Mg(OH)2 4. (NH4)3PO4 Find the percent composition (percent by mass) of the given element in the following compounds: 1. Fluorine in AgF 2. Hydrogen in glucose

You can view more similar questions or ask a new question.