chemistry(Urgent Please help)

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.945 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid).

It requires 33.9 mL of barium hydroxide to reach the endpoint.

A. What is the molarity of the barium hydroxide solution?

This barium hydroxide solution is then used to titrate an unknown solution of nitric acid.

B. If 19.8 mL of the barium hydroxide solution is required to neutralize 20.4 mL of nitric acid, what is the molarity of the nitric acid solution.

I have no idea how to do this. Thank you for your help!

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. These are essentially 4-step problems.
    1. Write and balance the equation. If we call potassium hydrogen phthalate just KHP, then
    Ba(OH)2 + 2KHP ==> 2H2O + BaP + K2P

    2. Convert grams to moles. moles KHP = 0.945/molar mass KHC8H4O4 = 0.945/204 = approximately 0.0046

    3. Using the coefficients in the balanced equation, convert moles KHP to moles Ba(OH)2
    0.0046moles KHP x (1 mole Ba(OH)2/2 moles KHP) = 0.0046 x (1/2) = 0.0023 moles Ba(OH)2.

    4. M Ba(OH)2 = moles Ba(OH)2/L Ba(OH)2
    M Ba(OH)2 = 0.0023/0.0339 = approximately 0.068 M

    Part B is done the same way. Now that you have the Ba(OH)2 standardized, use that, with the same process, to determine the molarity of the HNO3.
    Remember that moles = M x L.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  2. Barium hydroxide is standardising usinig pottassium hydrogen phthalate..phenolphthalein is the indicator.(.02 N BaOH standardising with .02 N PHT)

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    a precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of: sodium sulfate iron(II) chloride calcium perchlorate barium hydroxide lead nitrate

  2. Chemistry

    A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out 338.mg of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL

  3. Chemistry

    A solution contains an unknown mass of dissolved barium ions. When sodium sulfate is added to the solution, a white precipitate forms. The precipitate is filtered and dried and found to have a mass of 258 mg. What mass of baium

  4. Science

    Barium sulfate, BaSO4, is a white crystalline solid that is insoluble in water. It is used by doctors to diagnose problems with the digestive system. Barium hydroxide, Ba(OH)2, is also a white crystalline solid and is used in

  1. chemistry

    1. (Answer c)The hydroxide ion concentration in a 1.0 mol/L solution of acetic acid at 25°C is a.4.2 x 10^-3M b.2.4 x 10^-11M c.2.4 x 10^12M d.2.4 x 10^-3M e.1.8 x 10^-5M I did [OH-]=root(Kw/Ka) x [salt] [OH-]=root(1.00 x

  2. Science

    Chromate ions react according to the following equation, where the left side of the reaction is yellow and the right side is orange. CrO42– + 2H+ ⇄ Cr2O72– + H2O A student adds sodium hydroxide (NaOH) to the solution at

  3. chemistry

    how much of a 1.50M solution sodium sulfate solution in milliliters is required to completely precipitate all the barium in 150.0mL of a 0.250 M barium nitrate solution

  4. Chemistry I - University Level

    Suppose 5.87 g of barium acetate is dissolved in 300. mL of a 71.0 m M aqueous solution of sodium chromate. calculate the final molarity of barium cation in the solution. You can assume the volume of the solution doesn't change

  1. chemistry

    An impure sample of barium hydroxide of mass 1.6524 g was allowed to react with 100 cm3 of 0.200 mol dm-3hydrochloric acid. When the excess acid was titrated against sodium hydroxide, 10.9 cm3 of sodium hydroxide solution was

  2. Chemistry

    Calculate the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2.

  3. AP Chem

    A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a

  4. chemistry

    A student determines the zinc content of a solution by first precipitating it as zinc hydroxide, and then decomposing the hydroxide to zinc oxide by heating. How many grams of zinc oxide should the student obtain if her solution

View more similar questions or ask a new question.