QUESTION 14 sugar solkution. You put 200 ml of this solution in a flask and add

Question

QUESTION 14 sugar solkution. You put 200 ml of this solution in a flask and add 800 mt of water f you took out 500 ml of the new solution and Suppose you made 1 L of a combined it with 500 ml of water, what proportion of the original sugar solution have you retai 0 1/5 ned? 1/10 1.20 o 1,100 QUESTION 15 An inspector screens batches of grape juice at a botting plant for bacterial contamination. For one 106 CFU. Which c batch of 1200 L, he finds that a 10-mL sample contains 15 would tell him approximately how many CFU were in the entire batch? O 1200 x (15-106) Type here to search

Explanation / Answer

Answer 14) Correct option is b) 1/10

It is because firstly final volume of 1000 ml was made by taking 200 ml of the original solution which makes it 1000/200 = 5 times diluted.

Then from this final volume made was 1000 ml by taking 500 ml of diluted solution. So the new solution is 1000/500 = 2 times more diluted.

Total dilution = 5 x 2 = 10.

So, the new solution is 1/10 concentrated of original solution.

Answer 15) Correct option is c) 1200 x {100 x (15 × 106)} cfu.

This is because given cfu is 15 x 106 in 10 ml. So, in 1 ml it is (15 × 106)/10. Now 1 L = 1000 ml and 1200 L = 1200 x 1000 ml. Actual cfu = 1200 x 1000 x (15 × 106)/10 which is equivalent to 1200 x {100x (15 × 106)} cfu/ml

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