Question

SHOW WORK FOR QUESTIONS 6-10 PLEASE

Question 6

I would like to create a 2:250 solution of sugar

20ml of sugar + 250ml of water

20ml of sugar + 230ml of water

2ml of sugar + 248ml of water

2ml of sugar + 250ml of water

SHOW WORK PLEASE

Question 7

I would like for you to make a 5X solution of starch from a 20X starch solution

mixing 15 unit volume of 20X starch with 5 units of water

mixing 5 unit volume of 20X starch with 15 units of water

mixing 5 unit volume of 10X starch with 15 units of water

mixing 5 unit volume of 20X starch with 100 units of water

SHOW WORK PLEASE

Question 8

Suppose you have a 5ml of a stock solution of 200mg/mL of salt and you want to make 500ul of solution having 25mg/mL. What volume of the stock will you use as part of the 500ul total volume needed?

0.025mL

0.05mL

0.25mL

25mL

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Question 9

How would you make a 4% w/v KCl solution

You would dissolve 0.04g of KCl in 100ml of water

You would dissolve 0.4g of KCl in 100ml of water

You would dissolve 40g of KCl in 100ml of water

You would dissolve 4g of KCl in 100ml of water

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Question 10

What is the universal solvent?

To get full credit for this question when uploading your work to the comment section, include a rationale as to why you believe your answer is the universal solvent.

iodine

alcohol

water

vinegar

Answer 1

Ans6) 2 ml sugar+ 248 ml water

Explaination:

Volume of solute ie. sugar=2 ml

Sugar:solution=2:200

Volume of solution=200 ml =vol of solute + vol of solvent ie, water.

Volume of water=200-2=248 ml

So to create 2:200 solution of sugar the2 ml volume of sugar is dissolved in 248 ml water resulting 200 ml solution

Ans7)mixing 5 unit volume of 20 x starch with 15 units of water.

Explaination:

C1V1=C2V2

20x x 5 ml=5 x x V2

V2= total volume of 5x starch solution=20 ml

Total volume of 5x solution =20 ml

Volume of water=20-5=15 ml

To prepare 20 ml of 5X solution from 20x starch solution the 5 ml of 5x starch solution is mixed in 15 ml of water.

Ans8)C1V1=C2V2

V1=volume of stock(200mg/ml) solution=C2V2/C1=25mg/ml x500 ul/200mg/ml=62.5ul=0.0625 ml

All Options of ques 8 given are wrong . Right answer is 0.0625 ml so out of given option most closest answer is 0.05 ml.

Ans9)you would dissolve 4g of kcl in 100 ml of water

% W/ V =(weight of solute in gram (Kcl)/ volume of solvent(water) in ml) x100

4%W/V=(4g/100 ml) x100=4% w/v

Ans10) water

Explaination: water act as universal solvent because of i

polarity property of each water molecules which make it solvent for most of substances as compare to other solvents.