Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![A scale removal
1- Calculate the molar volume of a perfect gas at 20 C and P = 1 bar. R-8.314 JK' mol".
2- 200 ml of HCI (8) 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 Si solution is obtained. In order to
calculate the concentration of S1, 20 ml of S, are titrated by the hydrochloric acid
already prepared. Equivalence is obtained after adding a volume Veq = 225 ml of
hydrochloric acid.
a) Write the equation for the titration reaction.
b) Determine the concentration of S. Calculate the mass of NaOH in S:
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)
| 225
10
30
40
PH
6- Trace the shape of the curve PH = f(Va).
scale: X-axis: 1 cm = 4 ml
y axis: 1 cm = 1 PH unit](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F223cde93-df9e-4d74-8864-2ae094eefce6%2F92a8447a-3232-4851-9d28-89efafdac48e%2Frs2a4km_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A scale removal
1- Calculate the molar volume of a perfect gas at 20 C and P = 1 bar. R-8.314 JK' mol".
2- 200 ml of HCI (8) 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 Si solution is obtained. In order to
calculate the concentration of S1, 20 ml of S, are titrated by the hydrochloric acid
already prepared. Equivalence is obtained after adding a volume Veq = 225 ml of
hydrochloric acid.
a) Write the equation for the titration reaction.
b) Determine the concentration of S. Calculate the mass of NaOH in S:
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)
| 225
10
30
40
PH
6- Trace the shape of the curve PH = f(Va).
scale: X-axis: 1 cm = 4 ml
y axis: 1 cm = 1 PH unit
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