A precipitate forms when a solution that is 0.10 M in Cu2+, Pb2+, and Ni2+ is saturated with H2S and adjusted to pH = 1. What sulfides are present in the precipitate?
H2S = 0.10 M; for H2S, Ka1 Ka2 = 1.1 1024
Ksp: CuS = 8.5 1045, PbS = 7.0 1029, NiS = 3.0 1021
a.
CuS, PbS, and NiS
b.
PbS and NiS
c.
NiS
d.
CuS and PbS
e.
CuS
Question 2
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 99 of the Mg2+ be precipitated as the hydroxide? Ksp for Mg(OH)2 = 8.9 1012
a.
8.35
b.
9.22
c.
6.50
d.
10.12
e.
4.86
Question 3
If 30 mL of 5.0 104 M Ca(NO3)2 are added to 70 mL of 2.0 104 M NaF, will a precipitate occur? (Ksp of CaF2 = 4.0 1011)
a.
No, because the ion product is greater than Ksp.
b.
Yes, because the ion product is less than Ksp.
c.
No, because the ion product is less than Ksp.
d.
Not enough information is given.
e.
Yes, because the ion product is greater than Ksp.
Amphipathic compounds in aqueous solution
Parrot Human (Solution)
Please provide me with a solution for part b.
Comparison of the two major forms of DNA
Algebraically determine the general solution, in degrees, of the equation below.
Different forms of a gene are called alleles