answer the question and number each one of them Eye protection is needed in lab

Question

answer the question and number each one of them

Eye protection is needed in lab even if only one person is doing experimental work. (True/False) (5 points) 1. 2. Eating in lab is acceptable if no one is doing experimental work. (True/False) (5 points) 3. A MSDS (Material Safety Data Sheet) should be consulted (check anylall that apply; 5 points) In case of fire or explosion In the event of a spill All of the above 3. Short Answers: (5 points each) a. 1 mole of the hydrogen carbonate ion, HCO, will neutralizemole(s) of H b. How many moles of H' will 1 g of NaHCO, neutralize? c. As the rate of a reaction increases, the time for a given number of moles of a reactant to be consumed (increases; decreases, stays the same). The focus of an MSDS is on d. 4. During a titration of an acid with NaOH, 27.4 mL of a 0.117 M were required for neutralization. How many moles of NaOH were dispensed. (5 points) 5. Write the net ionic equations that explain the following observations: (5 points each) a. the dissolution of AgCI upon NH, addition. b. the neutralization of H' with OH

Explanation / Answer

1. TRUE
2. False. Not acceptabel to eat in the lab.

3. All the above

4.

(a) 1 mol of HCO3- will neutralise 1 mol of H+.

HCO3- (aq.) + H+ (aq.) --------------> H2O (l) + CO2 (g)

(b)

Mass of NaHCO3 = 1 g.

Molar mass of NaHCO3 = 23 + 1 + 12 + 48 = 84 g/mol

Moles of NaHCO3 = mass / molar mass = 1 / 84 = 0.0119 mol

NaHCO3 (aq.) + H+ (aq.) ------------> Na+ (aq.) + H2O (l) + CO2 (g)

1 mol of NaHCO3 needs 1 mol of H+

Then, 0.0119 mol of NaHCO3 needs 0.0119 mol of H+

(c) Decreases.

Because, rate is the number of moles reactant that changed per second.

5.

Moles of NaOH = Molarity * Volume in mL / 1000

n = 0.117 * 27.4 / 1000

n = 0.00320 mol

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