Gen Chem 2

Question 1

weak acid Ka

Answer 1

<1 (b/w 10^-2 and 10^-14)– pKa b/w 2 and 14

strong acid Ka >1 — small pKa– negative

Ka is temperature specific

Ka = [H+][A-]/[HA]

Question 2

Ksp

Answer 2

Hg2Cl2 -> Hg2 2+ + 2Cl-
Ksp = [Hg2 2+][Cl-]^2

Equilibrium:

initial = 0, 0
+x, + 2x
Eq: x, 2x

4x^3 = Ksp (given)

if adding 0.5 M NaCl, eq is 0.5 + 2x; plug in, cancel +2x
0.25x = Ksp

Question 3

What reacts violently with water

Answer 3

2A metals like Mg

Potassium as a salt does not react violently w/ water, it’s an ion

Uranium does not react violently w/ water; it’s just violent in general

Question 4

high attenuation of light

Answer 4

absorb photons = goes to higher energy state; doesn’t change number of electrons
-Cu2+