Question

AP CHEM HELP.
How much NaCl should be added to 0.35 L of a 0.15 M solution of AgNO3 so that it reacts completely with the silver to form AgCl(s)?
A. 8.8 g
B. 3.07 g
C. 0.0525 g
D. 0.89 mg

Answer 1

is it C?

Answer 2

how many MOLES of Ag+ ions are present in 0.35L of 0.15M solution?

Answer 3

1 mole

Answer 4

not even close. you're given a volume and concentration of a solution, how do you find moles given those two?

Answer 5

multiply it so 0.0525 moles

Answer 6

ok, now what's the mole ratio of Ag+ to Cl- ions when making silver chloride?

Answer 7

1:1

Answer 8

good. so that means 0.0525 moles of silver will require the same number of moles of chloride ions. What MASS of sodium chloride contains that many moles of Cl-1 ions?

Answer 9

35.45g

Answer 10

of CI- in 1 mole NaCl

Answer 11

but it's mass of sodium chloride, not just chloride ions.

Answer 12

1 mole of sodium chloride is 58.5g, but you don't need that much, you only need 0.0525 moles

Answer 13

im not sure how to figure that out

Answer 14

it's a ratio of units
\[0.0525 \cancel{moles} * (\frac{58.5g}{1 \cancel{mole}})\]

Answer 15

3.07

Answer 16

unit?

Answer 17

grams

Answer 18

grams

Answer 19

ok, so the answer is 3.07 grams.

Answer 20

it is

Answer 21

Thanks!

Answer 22

yw