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A dirty buret will often have drops of solution adhere to the side after titration. How...

A dirty buret will often have drops of solution adhere to the side after titration. How does this affect the calculated moles of Na2S2O3 added?

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Answer #1

Solution.

The volume of solution represented by drops cannot be counted in easy way. For instance, according to the measurment you spent 25 mL of Na2S2O3, and actually x mL is still adhered in the form of drops. So, the volume actually added is (25-x) mL.

The number of moles added can be calculated using the formula

n = cV,

so using a dirty buret the result is nexp = 25c, but actual amount of substance added is n = (25-x)c. As a result, the calculated amount of Na2S2O3 will be greater then the actual value. The ratio is

.

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