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Pick Your Poison

Naturally occurring tartaric acid is found in the levo (L-) form (pictured below). If given a sample of optically pure tartaric acid of unknown isomeric form, which laboratory instrument or technique would you use to determine its identity?

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Buffer Buffoon

A student creates a 1M citrate (C3H5O(COO)33-) buffer solution at pH 5.0. He then dilutes the solution to 200 mM, and adds it to his experiment. What is the pH of the 200 mM buffer solution?

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The pH Value Is Right

Which set of 1 Molar solutions has the correct pH values?

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Phase Changes

Which opposite Phase Changes occur at the same temperature for a pure substance?

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Endpoint of a Titration

Which of the following is NOT needed to calculate the endpoint of a titration?

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Mass of the Gas

The density of an unknown gas under STP conditions is 3.17 g.L-1. What is the molecular mass of the gas?

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Recrystallization and You

Which statement below about recrystallization is NOT correct?

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Liters of HCl

How many liters of 0.3M HCl can be made from a 2L stock solution of 1.5M HCl?

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The Gas Law

The following statement is a description of which Gas Law? “As a gas is heated under constant pressure its volume will increase in proportion to the change in temperature.”

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Comparing pKa and pH

For a very weak acid, you would expect the pH to be:

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