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7 Cards in this Set

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(T/F) Only at 25 deg C does a pH of 7 imply neutrality.
True.
Atomic weight changes when an atom becomes an ion.
False.
Water, unlike most pure liquids, freezes first at the top of its container rather than at teh bottom because
- the density of the liquid is greater than that of the solid;
- unlike most substance, water is less dense in the solid state than it is in the liquid state, thus a mixture of the two phases will have the less dense solid phase floating on top of the more dense liquid phase.
(T/F) The more positive the value of E_knot, the more easily the half-cell reaction as written is likely to proceed.
True.
What is the relationship btw normality and molarity?
N = n × M (where n is an integer)

For an acid solution, n is the number of H+ provided by a formula unit of acid.

example: A 3 M H2SO4 solution is the same as a 6 N H2SO4 solution.

For a basic solution, n is the number of OH- provided by a formula unit of base.

example: A 1 M Ca(OH)2 solution is the same as a 2N Ca(OH)2 solution.
- Apply the titration formula: V_A N_A = V_B N_B
- Need to convert volume to mL and the concentrations to Normality.
- Acetic acid is monoprotic => N=M*1=0.01
- Calcium hydroxide provides two OH- groups per formula thus its normality will be twice its molarity; ==> N=2M=2*0.1=0.2
- V_B = V_A N_A / N_B ; plug and chug.
How would you go about solving the question?
What is the generalized equilibrium expression of a weak acid that will hydrolyze in aqueous solution.
A- + H2O <=> HA + OH-
- since hydroxide ion, OH- is formed by this hydrolysis, the solution requires a basic pH.
- Since the weak acid, HA, is also formed, an equilibrium persists keeping the pH below that expected for a similar concentration of a strong base (like NaOH) which will be 100% ionized in aqueous solution.