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___________ expresses the margin of uncertainty associated with a measurement.

Calculate the pH of water at 50°C. Kw = 5.31 × 10−14 at 50°C.

Three different bottles of vinegar were analyzed by the same analyst for percentage acetic acid content. The following results were obtained. Bottle no.1 Bottle no. 2 Bottle no.3 3.88 5.72 [K] 3.92 5.61 [L] 3.75 5.60 [M] 3.84 5.68 [N] 3.91 5.66 [O] How many measurements of sample 3 would have to be taken to reduce the 90% C.I. to 0.0750 ppm? (report 3 decimal places)

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___________ is a consistent error that can be detected and corrected.

Three different bottles of vinegar were analyzed by the same analyst for percentage acetic acid content. The following results were obtained. Bottle no.1 Bottle no. 2 Bottle no.3 [A] 5.72 8.13 [B] 5.61 8.19 [C] 5.60 8.17 [D] 5.68 8.05 [E] 5.66 8.21 Calculate the  margin of error for the 99.5% confidence interval for sample 1 if s→σ and has a value of [X]. (Report 3 decimal places) 

Three different bottles of vinegar were analyzed by the same analyst for percentage acetic acid content. The following results were obtained. Bottle no.1 Bottle no. 2 Bottle no.3 3.88 [F] 8.13 3.92 [G] 8.19 3.75 [H] 8.17 3.84 [I] 8.05 3.91 [J] 8.21 Calculate the  margin of error for the 95% confidence interval for sample 2 if s→σ.

When extracting a sample with a liquid, the liquid is __________ from the sample.

A(n) _____________ is used to grind solids into smaller particles.

Determine the concentration of Ca2+ in a solution with a pCa2+ of 10.20. Report the concentration with the correct number of significant figures. pCa2+ = –log[Ca2+]