Define the following terms as they pertain to this experiment: a saturated solut

Question

Define the following terms as they pertain to this experiment: a saturated solution the common ion effect Why should enough .solid KHT be added to the KCl-NaCl solution to ensure that some solid remains undissolved after the 20-min stirring? Why should you make sure that the beaker. Funnel, and filter paper are dry before you being to filter the saturated KHT solution? Prior to the titration with NaOH solution, you will add a measured volume of the filtered saturated KHT solution to an Erlenmeyer flask, Is it necessary that this flask be dry? Briefly explain In an experiment similar to this one. the solubility of potassium hydrogen oxalate (KHC2O4, molar mass = 128 13 g mol-1) is determined A 5.0 10-2M aqueous solution of KC1 is saturated with potassium hydrogen oxalate. The following equilibrium results: KHC2O4 (s) K+ (aq) + HC2O4- (aq) Following saturation, the solution is filtered Portions of the filtered saturated solution are titrated with 0 1172M NaOH solution. The following data are obtained:

Explanation / Answer

All of the solutions that you will prepare will be saturated solutions of KHT. So, it is not important to know exactly how much KHT you add. What is important is that some undissolved solid remains, indicating that the solution is saturated. You will then filter the saturated solution and determine the amount of KHT that has dissolved by titrating the solution with NaOH.

Solution 1

Add 100.0 mLs of 0.1M NaCl to a 150 mL beaker.

Add 0.0 mLs of 0.10 M KCl

Add enough KHT (about 1.9 - 2.1 g) so that after stirring for 20 minutes some solid KHT will remain.

Stir for 20 minutes and add more KHT if needed.

Filter the solution and fill a buret with this solution.

What is the initial concentration of K+inSolution 1?

Solution_(to be assigned)

Add _____ mLs of 0.1M NaCl to a 150 mL beaker.

Add _____ mLs of 0.10 M KCl

Add enough KHT (about 1.9 - 2.1 g) so that after stirring for 20 minutes some solid KHT will remain.

Stir for 20 minutes and add more KHT if needed.

Filter the solution and fill a buret with this solution.

What is the initial concentration of K+inSolution ____?

Solution_(to be assigned)

Add _____ mLs of 0.1M NaCl to a 150 mL beaker.

Add _____ mLs of 0.10 M KCl

Add enough KHT (about 1.9 - 2.1 g) so that after stirring for 20 minutes some solid KHT will remain.

Stir for 20 minutes and add more KHT if needed.

Filter the solution and fill a buret with this solution.

What is the initial concentration of K+inSolution ____?

Part 2. Determining the [HT-] in each solution.

You will determine the [HT-] in each solution above by titration with a standard sodium hydroxide solution. You will perform two titrations for each solution You will use two 25-mL burets to accurately measure volume of the KHT solutions and the NaOH solution.

For each titration, add about 20 mLs of the KHT solution to a 125-mL flask. Add phenolphthalein indicator to the flask. Titrate with NaOH to a light pink endpoint. Record your data.

Solution 1

Solution_(to be assigned)

Solution_(to be assigned)

Part 3. Complete the Equilibrium Table and Calculate Ksp.

For each trial, complete the Equilibrium Table. The initial concentration of K+depends upon the amount of KCl that you start with. The concentrations of the ions at equilibrium refer to the concentrations after the solution is saturated with KHT.

Solution 1 - Trial1

Ksp =

Solution 1 - Trial2

Ksp =

Solution - Trial1

Ksp =

Solution - Trial2

Ksp =

Solution - Trial1

Ksp =

Solution - Trial2

Ksp =

Trial 1 Trial 2 Volume of KHT solution Volume of NaOH solution Moles of NaOH Moles of KHT Molarity of KHT

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