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1- Calculate the molar volume of a perfect gas at 20 C and P=1 bar. R-8.314 JK" mol.

1- Calculate the molar volume of a perfect gas at 20 C and P=1 bar. R-8.314 JK" mol.

Introduction to General, Organic and Biochemistry
Introduction to General, Organic and Biochemistry
11th Edition
ISBN:9781285869759
Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Chapter6: Solutions And Colloids
Section: Chapter Questions
Problem 6.78P: 6-78 (Chemical Connections 6A) Oxides of nitrogen (NO, NO2,N2O3) are also responsible for acid rain....
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11:15 il 4G O acid base sheet Exersice 5 A scale removal 1- Calculate the molar volume of a perfect gas at 20 Cand P =1 bar. R-8.314 JK mol. 2- 200 ml of HCI (g) gas hydrogen chloride are dissolved in a volume V = 50 ml of water. a) Write the equation of the dissociation reaction of this acid in water b) Calculate the concentration of HCl in water and deduce the PH of the obtained solution. 3- Sodium hydroxide is used as descaling agent, a Sodium hydroxide solution is prepared by dissolving 10 grams in 500 ml of water, a S1 solution is obtained. In order to calculate the concentration of S, 20 ml of S, are titrated by the hydrochloric acid already prepared. Equivalence is obtained after adding a volume Veq = 22.5 ml of hydrochloric acid. a) Write the equation for the titration reaction. Determine the concentration of S. Calculate the mass of NaOH in S b) : c) Deduce the mass percentage of NaOH. 4- Find the relation between PH and the volume of acid added at each instant ofter and before the equivalence. 5- Complete the following table: Va (ml) PH 6- Trace the shape of the curve PH = f (Va). scale: X-axis: 1 cm = 4 ml 10 22.5 30 40 y axis: 1 cm =1 PH unit PH-metric titration: 20 ml of the diluted solution (S) is titrated with a hydrochloric acid solution of concentration Ca = 0,1 mol/L, using a pH meter. Before starting the titration, a volume Vof water is added in the beaker containing S. 1- Give the reason for the addition of water. Indicate if this addition has an effect on the volume of acid needed to reach equivalence. The curve representing the variation of PH versus the volume of acid added is given:
Transcribed Image Text:11:15 il 4G O acid base sheet Exersice 5 A scale removal 1- Calculate the molar volume of a perfect gas at 20 Cand P =1 bar. R-8.314 JK mol. 2- 200 ml of HCI (g) gas hydrogen chloride are dissolved in a volume V = 50 ml of water. a) Write the equation of the dissociation reaction of this acid in water b) Calculate the concentration of HCl in water and deduce the PH of the obtained solution. 3- Sodium hydroxide is used as descaling agent, a Sodium hydroxide solution is prepared by dissolving 10 grams in 500 ml of water, a S1 solution is obtained. In order to calculate the concentration of S, 20 ml of S, are titrated by the hydrochloric acid already prepared. Equivalence is obtained after adding a volume Veq = 22.5 ml of hydrochloric acid. a) Write the equation for the titration reaction. Determine the concentration of S. Calculate the mass of NaOH in S b) : c) Deduce the mass percentage of NaOH. 4- Find the relation between PH and the volume of acid added at each instant ofter and before the equivalence. 5- Complete the following table: Va (ml) PH 6- Trace the shape of the curve PH = f (Va). scale: X-axis: 1 cm = 4 ml 10 22.5 30 40 y axis: 1 cm =1 PH unit PH-metric titration: 20 ml of the diluted solution (S) is titrated with a hydrochloric acid solution of concentration Ca = 0,1 mol/L, using a pH meter. Before starting the titration, a volume Vof water is added in the beaker containing S. 1- Give the reason for the addition of water. Indicate if this addition has an effect on the volume of acid needed to reach equivalence. The curve representing the variation of PH versus the volume of acid added is given:
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