Lab 8 Determination of the Solubility Product Constant of an Organic Sal Pre-Lab

Question

Lab 8 Determination of the Solubility Product Constant of an Organic Sal Pre-Laboratory Assignment 1. In an appropriate source, read a discussion of the laboratory techniques used in acid-base titrations. 2. An experiment similar to the one in this module was performed to determine the solubility and the solubility product constant of gallic acid, a monoprotic organic acild (gmm- 170.12). The equilibrium involved is: uing 1.14 x10-M NaOH were performed, and the following data were obtained. determination temperature of solution, "C volume of acid solution titrated, mL volume of NaOH solution used, mL 20.2 25.00 14.61 20.4 22.00 13.02 20.1 20.10 11.73 Calculate the following number of moles of NaOH used number of moles of H titrated H"1 in acid solution IC,H,o,Coo-1 in acid solution average Kop solubility of acid in g per 100 mL chemistry handbook value for 1.15 g per 100 mL solubility at 20°C

Explanation / Answer

MOLARITY OF NAOH= 0.114 M

VOLUME OF NAOH USED= 39.36 ml

MOLES OF NaOH= MOLARITY*  VOLUME OF NAOH USED

= 0.114 M*  39.36 ml

= 4.49 mol

MOLARITY OF ACID* VOLUME OF ACID =  MOLARITY OF NaOH* VOLUME OF NaOH

MOLARITY OF ACID* 67.10 == 0.114* 39.36

MOLARITY OF ACID==  0.114* 39.36/ 67.10

== 0.067 M

MOLARITY = NUMBER OF MOLES OF ACID / VOLUME OF SOLUTION

NUMBER OF MOLES OF ACID=  MOLARITY*  VOLUME OF SOLUTION

==  0.067 M* 67.10

=== 4.50 MOLES

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