Before adding color reagent, sample tube #2 contained 0.35 mL of a 1:100 dilutio

Q: Before adding color reagent, sample tube #2 contained 0.35 mL of a 1:100 dilutio

Tube 2 contains 0.35 ml of 1:100 diluted sample Y and Tube 3 contains 1 ml of 1:1000 dilution of sample Z Therefore, the dilution of sample Z is 10 fold more in comparison with sample Y. Hence option 3-" Sample Z is less concentrated than sample Y" is the correct one.

ID: 3165187 • Letter: B

Question

Before adding color reagent, sample tube #2 contained 0.35 mL of a 1:100 dilution of sample Y plus 0.65 mL of buffer A, and sample tube #3 contained 1 mL of a 1:1000 dilution of sample Z. Which of the following conclusions can you draw from the data in this assay?

Sample X is less concentrated than sample Y.

Sample Y is less concentrated than sample X.

Sample Z is less concentrated than sample Y.

Sample X and Y have approximately the same concentrations.

Sample Y and Z have approximately the same concentrations.

BSA (micrograms) A595 10 0.17 20 0.29 30 0.41 40 0.55 50 0.69

Explanation / Answer

Tube 2 contains 0.35 ml of 1:100 diluted sample Y and Tube 3 contains 1 ml of 1:1000 dilution of sample Z

Therefore, the dilution of sample Z is 10 fold more in comparison with sample Y. Hence option 3-" Sample Z is less concentrated than sample Y" is the correct one.

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Before adding anything After adding H + After adding OH -1 Color of Cr 2 O 7 -2

Before adding color reagent, sample tube #2 contained 0.35 mL of a 1:100 dilutio

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Before adding color reagent, sample tube #2 contained 0.35 mL of a 1:100 dilutio

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