Question

hydrochloride avid hcl is aclassified as a strong

Hydrochloric acid, HCl, is classified as a strong acid in water. This means that it produces 1. hydrogen ions a) no b) a relatively small fraction of the maximum number of hydrogen ions c) a relatively large fraction of the maximum number of hydrogen ions d) 100 % of the maximum number of possible hydrogen ions 2. Benzoic acid is considered to be a polar molecule. Which one completely dissolve benzoic acid at room temperature? of the following solvents will a) cyclohexane b) pentane c) 95% ethanol/H2O d) all of these solvents The primary reason for the addition of anhydrous magnesium sulfate to the organic solvent layer resulting from the extraction of an organic compound from water is to 3. a) remove residual water b) remove residual NaCl d) neutralize the residual NAOH c) remove residual acid catalyst Isopropyl alcohol/water (1:1) is an example of a 4. a) polar solvent b) high boiling alkane solvent c) nonpolar solvent d) all of these 5. Ten grams of an organic solid is dissolved in 100 ml of H2O (solvent 1). Which of the following extraction methods will remove the largest amount of the organic solid from the aqueous solution? a) three 50 ml portion extractions with ether (solvent 2) b) two 50 ml portion extractions with ether (solvent 2) c) one 150 ml portion extraction with ether (solvent 2) d) one 50 ml portion extraction with ether (solvent 2) Two organic solid compounds, A and B are observed to have the same done to prove that these substances are the same compound? 6. melting point. What should be a) look up the literature m.p. values of compoundA and B b) recrystallize compound A c) recrystallize compound B d) perform a mixed melting point on a sample containing equal amounts of compounds A and B

Answer 1

1] option d is correct.

strong acids dissociate 100%

2] option c is correct.

Polar solutes are soluble in polar solvent.

3] option a is correct.

Anhydrous magnesium sulfate (MgSO4) is commonly used as a drying agent.

4] option a is correct.

water and the alcohol both are polar solvent