1) What is the pH of a 0.1 mM solution of hydrochloric acid at 37 degrees celsiu

ID: 845594 • Letter: 1

Question

1) What is the pH of a 0.1 mM solution of hydrochloric acid at 37 degrees celsius. show work

a) 1

b) 2

c) can not be determined with information provided

d) 4

e) 3

f) -0.3

2) Adding table sugar to iced tea and stirring it results in which of the following?

a) A decrease in free energy due to broken weak interaction between sugar molecules

b) An increase in enthalpy as heat moves into the sugar

c) An increase in free energy because there is no longer a solvation layer around the sugar crystal

d) an increase in the entropy as the sugar dissolves

e) a negative value for delta S because the solute is more random

1) Concentration of HCl = 0.1 mM = 10-4 M

Since HCl is strog acid, it dissociates completely

Thus, concentration of hydrogen ion [H+] due to dissociation of acid = 10-4 M

pH = -log10[H+] = -log10(10-4) = 4

2) As sugar dissolves, the sugar molecules move apart randomly due to stirring, causing an increased disorder in the system

Thus, it causes an increase in entropy as sugar dissolves

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