A. What is the molarity of sodium ions in a solution prepared by mixing 202.1 ml of 0.63 M sodium phosphate with 239 ml of 1.31 M sodium sulfide. Enter to 2 decimal places.B. A 17.3 ml sample of a 1.49 M potassium chloride solution is mixed with 58.6 ml of a 1.34 M lead(II) nitrate solution and a precipitate forms. The solid is collected, dried, and found to have a mass of 0.5 g. What is the percent yield?...
Twenty grams of soil was added to 50 mL of water. After mixing, the
suspension was serially diluted and used to inoculate spread plates
(0.125 mL per plate). The inocula from the three highest dilutions,
10-4, 10-5, and 10-6, produced 210, 29, and 2 colonies,
respectively. What was the bacterial concentration in the soil? (3
pt)
After mixing 5.00 mL of the 5.0×10–5 M crystal violet solution
with 5.00 mL of 0.20 M NaOH, what is the concentration of crystal
violet and hydroxide ions in the solution at the start of the
reaction? Is it a reasonable assumption that the concentration of
OH– is much greater than that of CV+? Why is this an important
assumption? Explain.
What is the molarity of each of the following solutions?
a. You pipet 25.00 mL of 0.335 M KCl into a 100 mL volumetric
flask and fill to the mark.
b. You pipet 10 mL of the solution from part (a) into a 50 mL
volumetric flask and dilute to the mark.
c. You pipet 5 mL of the solution from part (b) into a beaker
and then pipet 20 mL of DI water into the beaker. (Assume volumes
are...
A solution is prepared by mixing 50.0 mL of 0.50 M
Cu(NO3)2 with 50.0 mL of 0.50 M Co(NO3)2. Sodium hydroxide
is then added to the mixture. Assume no change in volume.
Ksp = 2.2 × 10-20 for Cu(OH)2, Ksp = 1.3 ×
10-15 for Co(OH)2
The hydroxide concentration at which the first metal hydroxide
will just begin to precipitate is __________M
Using the integer designators, the metal hydroxide that
precipitates first is {(1) Cu(OH)2 or
(2) Co(OH)2 } _____________M...
A solution is prepared by mixing 50 mL of 1 M Pb(NO3)2 and 75 mL
of .5 M NaF. Calculate the concentration of F- ions present at
equilibrium. (Hint: First, write and balance the double
displacement reaction taking place between Pb(NO3)2 and NaF to form
PbF2(s). Perform the necessary stoichiometry (including finding
which reactant is limiting) to calculate how much of each reactant
remains after the reaction goes to completion. Remember that
stoichiometry has to be done in moles. Once...
A solution is prepared by mixing 100 mL of .01 M Pb(NO3)2 and
100 mL of .001 M NaF. Will PbF2(s) precipitate in this reaction?
Calculate the concentration of F- ions present at equilibrium.
PbF2(s) <--> Pb2+(aq) + 2F-(aq) Kc= 3.7E-8
Please show all work! Thank you!