A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 ´ 10^-4 M. What is the equilibrium constant, Ka, for this acid?
a. 5.0 ´ 10^-2
b. 5.0 ´ 10^-3
c. 2.5 ´ 10^-4
d. 2.5 ´ 10^-5
e. 2.5 ´ 10^-6
2. (Points: 1)
What is the carbonate-ion, CO3^-2, concentration in a 0.037 M carbonic acid solution?
a. 1.2 ´ 10^-4
b. 4.2 ´ 10^-7
c. 7.6 ´ 10^-8
d. 4.8 ´ 10^-11
e. 5.2 ´ 10^-19
A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 ´ 10-4 M. What is the equilibrium constant, Ka, for this acid?
a. 5.0 ´ 10-2
b. 5.0 ´ 10-3
c. 2.5 ´ 10-4
d. 2.5 ´ 10-5
e. 2.5 ´ 10-6
2. (Points: 1)
What is the carbonate-ion, CO3-2, concentration in a 0.037 M carbonic acid solution?
a. 1.2 ´ 10-4
b. 4.2 ´ 10-7
c. 7.6 ´ 10-8
d. 4.8 ´ 10-11
e. 5.2 ´ 10-19
3. (Points: 1)
Which solution would show the GREATEST change in pH on the addition of 10.0 mL of 1.0 M NaOH to 1.0 L of each of the following solutions?
a. 0.50 M CH3COOH + 0.50 M NaCH3COO.
b. 0.10 M CH3COOH + 0.10 M NaCH3COO.
c. 0.50 M CH3COOH.
d. 0.10 M CH3COOH.
e. 0.50 M NaCH3COO.
4. (Points: 1)
Which of the following, when added to water, will not change the pH?
a. NaHCO3
b. NH4NO3
c. K2SO3
d. KI
e. HCN
can u please show me working out, i am in emergency.
3 answers
too many questions in one post. Pick one or two that represent types and repost.
Question 3
Answer: B
Answer: B
1 answer