QUESTION 9 Kemmi Major needs to make an approximately 1.00 M solution from the 3
ID: 984509 • Letter: Q
Question
QUESTION 9
Kemmi Major needs to make an approximately 1.00 M solution from the 3.00 M stock solution. Only a 100 mL volumetric flask is available. Volumetric pipets of all different sizes are available. Kemmi realizes one pipet is not sufficient. She also knows each individual measurement made with a pipet creates a little more error. Help her choose the volumetric pipet sizes that give the fewest possible measurements to make the desired concentration.
1 mL
3 mL
5 mL
8 mL
10 mL
15 mL
25 mL
50 mL
QUESTION 10
What is the actual final concentration of Kemmi’s solution (made in the previous question)? Answer with two significant figures and units of M.
1 mL
3 mL
5 mL
8 mL
10 mL
15 mL
25 mL
50 mL
Explanation / Answer
From MIVI = M2V2, you get 33.33 ml of solution that need to dilute to 100ml will give ypu 1.0 M.solution.
Now need to take 33.3 ml, so 25ml pipet + 10 ml pipet (to take 8.3ml) can be used.
As you need exact 33.333 ml, but taken amount is 33.3 ml,
so 33.333 ml is for 1.0 M , 33.3 ml for what molar?
33.3/33.333 = 0.99 M actual concetration.
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