Answer the following questions as either true (a) or false (b) statements. 1. In

Question

Answer the following questions as either true (a) or false (b) statements.

1. Increasing the concentrations of the components of a buffer solution will increase the buffer capacity.

2. Addition of a strong acid to a solution of a weak acid suppresses ionization of the weak acid due to the common ion effect.

3. A reducing agent accepts electrons.

4. In a zinc/copper galvanic cell, the reading on the voltmeter (in volts) is the same as Ecell­

5. rate is inversely proportional to the number of molecular collisions per second

Please give a brief reason why each is true or false.

Explanation / Answer

1. Buffer capacity is directly related to the concentration of the acid and base into the buffer. The more concentrated be the acid and base more quantity of acid (for instance) can be added without losing the amortiguation properties of the buffer. True

2. The strong acid provides H3O+ ion to the solution, then shifting the reaction towards the protonated weak acid, which means that H3O+ presence supresses the ionization of the weak acid. True

3. A reducing agent oxidates itself, that means that its oxidation state increases, thus it needs to lose electrons. False

4. The Voltaic or GAlvanic cell is a redox reaction that spontaneously produces the circulating of electron current. Then the volatage produced by this cell(voltmeter reading) will be the Ecell calcualted theoretically by the standard potentials of the half reaction (should be around 1.10 V). True

5. Taking in account the collision theory the rate of a reaction is directly proportional to the number of effective collisions between the reactant molecules. This is why, as the concentration of the reactants is increased (more collisions occurs) the rate also increases. False

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