A chemist places 1.9043 g of Na2SO4 in a 100 mL volumetric flaskand adds water to the mark.

She then pipets 15 mL of the resulting solution into a 50 mLvolumetric flask and adds water to the mark and mixes to make asolution.

She then pipets 15 mL of this new solution into a 100 mLvolumetric flask and dilutes to the mark.

Determine the molar concentration of sodium sulfate in the mostdilute solution prepared.

Report your answer using the correct number of sig figs.

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Lelia LubowitzLv2

23 Feb 2019

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A chemist obtains 250.0 mL of a solution containing an unknown concentration of calcium iodide, CaI2. He pipets 25 mL of this solution into a 100 mL volumetric flask and dilutes to the mark. He then pipets 10 mL of this diluted solution into a 100 mL volumetric flask and dilutes to the mark. He analyzes some of the solution from the final volumetric flask and finds that the iodide ion concentration is 2.46E-6 (2.46 × 10-6) M. (Note: in solution, calcium iodide breaks apart into one Ca2+ ion for every two I- ions, so a solution that is 1.0 M in CaI2 is 2.0 M in I-.) Determine the molar concentration of calcium iodide in the original solution. Report your answer to the correct number of sig figs. Recall the precsion of volumetric pipets and flasks.

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26) One weighs 32.78 grams of NaOH and dissolves it in water(with stirring) to the mark in a 1500 mL volumetric flask.
27)One adds 25.00 mL of the solution in # 26 above to a 100 mLvolumetric flask and adds enough
water to fill the flask to the mark with stirring.
(a) What is the molarity of the resulting solution?

(b) One titrates 25.67 mL of a 0.156 M H2SO4 solution with thediluted NaOH solution. How manymilliliters of the NaOH solution arerequired?

Will give lifesaver points! thanks