Exam Review Acid Problems Updated

Exam Review Acid Problems Updated - and 78.5mg of a white...

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Exam Review Acid Problems: 1. In an acid base titration, you have 300 mL of a KOH compound, and in order to reach equivalence, you add to the KOH an unknown volume of .65M hydrochloric acid. Hydrogen chloride (HCl) is a naturally occurring gas in nature, and a sample of aqueous hydrochloric acid may be converted into gaseous HCl. If the HCl in a hydrochloric acid sample of the same volume as that added to the KOH compound is liberated into the gaseous state, it is found to occupy a volume of 2.5L at 25 degrees Celsius and at 2 atm. What is the initial KOH concentration? 2. A sample of HCl is added to excess Pb(NO 3 ) 2 . Upon completion of the reaction between the lead nitrate and the hydrochloric acid, a titration is performed on the remaining solution and it is found that 250mL of NaOH are needed to reach equivalence. After the titration, the solution is poured though a filter
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Unformatted text preview: and 78.5mg of a white solid precipitate are isolated. What is the concentration of the sodium hydroxide added in the titration. 3. If.466M H 2 SO 4 is added to KOH, and the volume of sulfuric acid added to the potassium hydroxide to reach equivalence is precisely twice the initial KOH volume, what is the KOH molarity? 4. A 8.678g sample of an unknown compound containing C, H, O, and N is combusted with excess oxygen in a 7.09L container. Once the reaction is complete, it is cooled to a temperature of 80 degrees celsius and the remaining oxygen gas is selectivey removed. After the oxygen is removed, the partial pressures of the remaning nitrogen gas (N 2 ) is .2905atm, the partial pressure of the carbon dioxide gas is 1.155atm, and finally, the partial pressure for the water vapor is 2.04atm. What is the empirical formula for the compound?...
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