question archive 1) What is the concentration of K+ in 0
1) What is the concentration of K+ in 0
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1) What is the concentration of K+ in 0.15 M of K2S?
Express your answer to one decimal place and include the appropriate units.
2.A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4will be needed to produce 525 mL of a solution that has a concentration of Na+ ions of 1.50 M ?
Express your answer to three significant figures and include the appropriate units.
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Answer:
1.
K2S ---> 2K+ + S2-
So,
concentartion of K+ = 2* concentration of K2S
= 2*0.15
=0.3 M
2.
[Na3PO4] = [Na+]/3
=1.5/3
=0.5 M
V= 525 mL = 0.525 L
Number of moles of Na3PO4 = M*V = 0.5*0.525 = 0.2625 mol
Molar mass of Na3PO4 = 164 g/mol
mass of Na3PO4 = number of moles * molar mass
= 0.2625 * 164
= 43.05 g
Answer: 43.05
