A pharmacist works with a 1.75 M solution of sodium bromide (NaBr) and water. The volume of the solution is 84.0 milliliters. If the pharmacist dilutes the solution to 1.00 M, what is the volume of the new solution? Express your answer to three significant figures.
Answers
Answer:
The volume of the new solution when 84ml of 1.75 M NaBr is diluted to 1 M is 147 ml
Explanation:
Step 1 : Calculate the number of moles in 84 milliliters of the drug (NaBr).
Molarity = moles per liter of a solution.
1.75 moles are in 1000 milliliters.
How many moles are in 84 milliliters.
84/1000 × 1.75 = 0.147 moles
There are 0.147 moles of the drug in 84 milliliters of the solution.
Step 2 : let the volume of the diluted solutions be x milliliters.
The moles remain constant.
Therefore there are 0.147 miles in x milliliters.
The new concentration of the solution is 1.00 M
1 mole —> 1000 ml
0.147 moles —>?
By cross multiplication we have :
0.147/1 × 1000 = 147 milliliters.
The drug is therefore diluted to 147 milliliters.
Answer:
The volume of the solution is 147 milliliters.
Explanation:
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