ACH 122 - Experiment 5

what are the 3 parts of the Experiment 5?

what are the 3 parts of the Experiment 5?

A. Preparation and Standardization of 0.1M NaOH B. Titration of vinegar and Preparation of a titration Curve C. Determination of pKa of acetic acid

In A what should you prepare and standardize?

0.1M NaOH

In the objectives of experiment, how many mL of 0.1M NaOH will u prepare?

250 mL

what will be titrated in the experiment

acetic acid

what will be prepared for a titration curve

acetic acid

In preparation of 0.1M NaOH Calculate the mass of ________ needed to prepare 250 mL of 0.1 M NaOH

solid NaOH

In preparation of 0.1M NaOH, Prepare 250 mL of 0.1 M NaOH by ___________________ in a small amount of water in a beaker. Then, transfer the contents of a 250 mL volumetric flask.

dissolving the weighted NaOH

In preparation of 0.1M NaOH Store the ______________ in a plastic bottle and label as 0.1 M NaOH

prepared NaOH solution

In Standardization of the NaOH how many pieces of what mL of Erlenmeyer Flask will you get

3pcs 125mL Erlenmeyer Flask

In Standardization of the NaOH Weigh in an analytical balance about ___________ of KHC8H4O4/KHP (potassium acid phthalate) in flask 1 and record the exact weight in the table.

0.5 to 0.6 g

When will you prepare a titration setup?

Part II Standardization of the NaOH

In the Standardization of the NaOH Fill a base buret with the ____________ up to the tip of the buret. Be sure that there are no air bubbles in the tip and body of the buret. Record the initial volume of NaOH.

NaOH solution

In Standardization of the NaOH, how many mL of water will you add for each of the 3 flasks?

25mL water

In Standardization of the NaOH, how many drops of phenolphthaelein will we add?

1 to 2 drops

In Standardization of the NaOH we will titrate the contents of flask 1 with NaOH until what color is obtained?

permanent light pink

Molarity of the NaOH formula

Mass KHP = M NaOH x Vol (mL) NaOH used/MW KHP x 1000

average molarity of the NaOH formula

Ave M NaOH = ( M trial 1 + M trial 2 + M trial 3) /3

In the titration of a vinegar, how many mL of a vinegar will be measured in step 1?

5mL

in Titration of Vinegar in what mL of beaker will the 5mL vinegar measured

100 mL

In Titration of Vinegar how many mL of distilled water will be added in step 1?

20 mL

In Titration of Vinegar transfer the contents to a clean _________mL volumetric flask

100 mL

In Titration of Vinegar in step 5, we shall measure accurately the 50mL of the vinegar using what?

graduated cylinder

in step 6 of Titration of Vinegar, we shall pour the 50 mL vinegar in what mL of erlenmeyer flask?

250mL

what shall be used as measuring the pH in Titration of Vinegar

pH paper pH meter

In Titration of Vinegar how many drops phenolphthalein will be added to the 2 flasks

3 drops

In titration of vinegar we shall Determine the approximate volume of NaOH when the phenolphthalein ____________.

changes color