A student determined the concentration of a sodium hydroxide solution, and after

Question

A student determined the concentration of a sodium hydroxide solution, and after four runs she reported a value of 0.1053 M with 98% confidence limits of +- 0.0014M. Assuming that no systematic errors were involved, which statement is true? Ans- The true value (for the concentration of sodium hydroxide in the solution) must be between 0.1039M and 0.1067 M., There is a 2% probability that the true value is greater than 0.1067 M., If the student repeats the analysis 100 more times, 98 of the values will be between 0.1039 and 0.1067M., There is a 98% probability that the true value lies between 0.1039 and 0.1067 M.

Explanation / Answer

1)

from above the information

the answer is

there is 98% probability that the true value lies between 0.1039 M and 0.1067 M

BECAUSE of this the confidence limit express the probability that, for any measurement, the resulting value will within a range of concentration (0.1067 - 0.1039)

and also there is a 2% probability that the resulting value is greater than 0.1067 or that the resulting value is lower than 0.1039.

so the answer is there is a 98% probality that the true values lies between 0.1039 and 0.1067

6)

ans)

from the given data

here standard addition method will be used to a good appraoach to determination of an analyte is to use

because it is used to minimize the matrix effects that interfere with analyte measurements,

this method is used in situations where sample matrix also contributes to the analytic signal

this situation is known as matric effect

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