Question

name 1. Briefly doscribe Pre-Laboratory Assignment 3. Write the chemical equation(s) for each part the experimet, as outlined in Equation 1 the (a) why you must carry out the oxidation of Cu oxidation of Cu b) Part ! (b) why you should be particularly careful when you work with 3M H2SO4 solution. 2. Briefly explain the meaning of each of the tol lowing terms as it relates to this experiment. (a) decant (b) filtrate (c) supernatant liquid

Answer 1

1) a. The reaction of nitric acid with Cu gives toxic NO2 gas. Therefore we must carry out oxidation in fume hood to avoid inhaling of this gas.

b.) 3 M H2SO4 is a powerful toxic oxidant. In order to prevent eye, skin and clothing contact, it should be handled with care.

2) a. Decant: it is a laboratory process to separate mixtures.decanting is just allowing solid - liquid mixture to settle and separate by gravity.

b.) Filtrate: The product of filtration; a gas or liquid that has been passed through filter is known as filtrate.

c.) Supernatant liquid: The clear liquid that lies above the solid residue after centrifugation, precipitation, crystallization or settling known as supernatant liquid.

a.) The reaction of nitric acid with Cu gives toxic NO2 gas. Therefore we must carry out oxidation in fume hood to avoid inhaling of this gas. b.) 3 M H2SO4 is a powerful toxic oxidant. In order to prevent eye, skin and clothing contact, it should be handled with care. a. Decant: it is a laboratory process to separate mixtures.decanting is just allowing solid - liquid mixture to settle and separate by gravity. b.) Filtrate: The product of filtration: a gas or liquid that has been passed through filter is known as filtrate. c.) Supernatant liquid: The clear liquid that lies above the solid residue after centrifugation, precipitation, crystallization or settling known as supernatant liquid. C_4 (S) + 4 H_3 O^+ (A Q) + 2 N O^-_3 (a q) rightarrow [C_4 9H_2 O)_6]^2 + (a q) + 2 N O_2 (g) [C_4 (H_2 O)_6]