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7 Cards in this Set

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  • Back
(T/F) Only at 25 deg C does a pH of 7 imply neutrality.
Atomic weight changes when an atom becomes an ion.
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.
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.