1. Identify the conjugate acid/base pairs for the following reaction: HCO3^- (aq
ID: 876286 • Letter: 1
Question
1. Identify the conjugate acid/base pairs for the following reaction: HCO3^- (aq) + H2O(aq) arrow H2CO3(aq) + OH^- (aq) 2. The measure of the resistance to the flow of a liquid is called: 3. When an acid reacts with a metal, what are the usual products? 4. A 20.0 ml sample of 0.115 M HCI was titrated with 31.5 ml of NaOH. What is the concentration of the NaOH? 5. What are the 3 intermolecular forces and which one is present in all molecules and atoms? 6. A 0.10 M solution of an electrolyte has a pH of 8.5. The electrolyte is: A) a strong acid. B) a strong base. C) a weak acid. D) a weak base. E) none of the above 7. If a mixture of gases contained 75% nitrogen at a pressure of 660 torr and 25% carbon dioxide at 220 torr, what is the total pressure of the system? 8. What is the concentration of H30 in 2.0 M hydrofluoric acid? A)1.0M B) 2.0 M C) > 2.0 M D)Explanation / Answer
The answers are given below.
1. given reaction
HCO3-(aq) + H2O(aq) ------> H2CO3(aq) + OH-(aq)
Here, HCO3-1 is the conjugate base of acid H2CO3, H2CO3 is the conjugate acid of base HCO3-
Similarly, OH- is the conjugate base of acid H2O and H2O is the conjugate acid of base OH-
2. Viscosity
3. Metal + acid --------> metal chloride + H2(g)
4. HCl + NaOH ------> NaCL + H2O
1 mole of acid reacts with 1 mole of NaOH in the reaction
calculate mols of HCl = M x L = 0.115 M x 0.02 L = 0.0023 moles
Thus, moles of NaOH = 0.0023 moles
Concentration of NaOH solution = moles/L = 0.0023 moles /0.0315 L = 0.073 M
5. Types of intermolecular forces are,
(a) London-dispersion force
(b) Dipole-dipole interaction
(c) Ion-dipole interaction
In all the molecules and atoms we will have, (a) and (b) types of interactions present.
6. The given electrolyte is D) a weak base
7. Total pressure = 660/760 + 220/760 = 1.16 torr
8. HF is a weak acid, thus concentration of H3O+ will be,
D) < 2.0 M
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