Question
Aqueous silver nitrate reacts with aqeous potassium iodide in a double-replacement reaction to produce a precipitate of silver iodide. If 34.6 ml of 0.563 M silver nitrate are used with 148.4 ml of potassium iodide:
a) What molarity of potassium iodide will be needed to consume all of the silver nitrate?
b) What will be the molarity of the aqueous product?
Please show your work so I can do similar problems later on
a) What molarity of potassium iodide will be needed to consume all of the silver nitrate?
b) What will be the molarity of the aqueous product?
Please show your work so I can do similar problems later on
Answers
DrBob222
moles AgNO3 = M x L = 0.563M x 0.0346L = 0.020 moles approximately but you need to redo all of these since I estimate all of the numbers.
KI(aq) + AgNO3(aq) ==>AgI(s) + KNO3(aq)
Now convert moles AgNO3 to moles KI using the coefficients in the balanced equation.
moles AgNO3 x (1 mole KI/1 mole AgNO3) = 0.02 x (1/1) = 0.02 mol KI.
MKI = moles KI/L KI
You know moles KI and L KI, solve for M KI.
b) The aqueous product is KNO3. Use EITHER KI or AgNO3 (you don't need both) to convert to moles KNO3. The same procedure is used with the coefficients.
moles AgNO3 x (1 mole KNO3/1 mole AgNO3) = 0.02 x (1 mole KNO3/1 mole AgNO3) = 0.02 x (1/1/) = 0.02 moles KNO3.
Then M KNO3 = moles KNO3/L soln.
YOu know moles KNO3 and you know the total volume of the solution.
KI(aq) + AgNO3(aq) ==>AgI(s) + KNO3(aq)
Now convert moles AgNO3 to moles KI using the coefficients in the balanced equation.
moles AgNO3 x (1 mole KI/1 mole AgNO3) = 0.02 x (1/1) = 0.02 mol KI.
MKI = moles KI/L KI
You know moles KI and L KI, solve for M KI.
b) The aqueous product is KNO3. Use EITHER KI or AgNO3 (you don't need both) to convert to moles KNO3. The same procedure is used with the coefficients.
moles AgNO3 x (1 mole KNO3/1 mole AgNO3) = 0.02 x (1 mole KNO3/1 mole AgNO3) = 0.02 x (1/1/) = 0.02 moles KNO3.
Then M KNO3 = moles KNO3/L soln.
YOu know moles KNO3 and you know the total volume of the solution.
Rachel
Thank you so much, I really appreciate your help!
Rachel
Sorry, but how did you find the total volume of the solution?
DrBob222
34.6 mL AgNO3 + 148.4 mL KI = ? mL total.
Don't get intimidated because these are mL or some unit you don't usually see. You add a gallon to a gallon and you have 2 gallons. Or a quart to a pint and you have 3 pints.
Don't get intimidated because these are mL or some unit you don't usually see. You add a gallon to a gallon and you have 2 gallons. Or a quart to a pint and you have 3 pints.
Lindsay
Oh! Okay thank you, that's very good advice. I understand now