Pre-Laboratory Assignment 1. Read an authoritative source for a discussion of th
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Pre-Laboratory Assignment 1. Read an authoritative source for a discussion of the safe and proper way to insert a thermometer or glass tubing into a rubber stopper. Read an authoritative source for a discussion of graphing techniques. 2. A student doing this experiment was puzzled by the fact that while each of the individual solutions being used is dangerous, the mixture made by combining the two solutions is much less dangerous. Actually, the resulting mixture could be safely disposed of by pouring it into the drain and diluting with a large amount of running water. Describe the hazards of each of the solutions. Explain why the mixture is not as hazardous as the original solutions from a waste-disposal point of view. with NaOH solution, using the of nitric acid (HNO3 mixed 3. A student determined the AH procedure described in this experiment. Fifty milliliters of 1.00M HNO, was added to 505 mL of 1.00M NaOH solution, and the following time-temperature data were recorded. temp, C temp... C time, min time, min 247 31.2 11.0 31.1 24.8 12.0 1.0 13.0 24.9 30.9 30.2 4.0 30.7 16.00 5.0 17.0 6.0 31.5 30.4 19.0 31.4 8.0 31.2 9.0 a) Make a plot of these time-temperature data.Explanation / Answer
Q2.
Describe hazards:
- NaOH --> this is pretty basic, it is a strong base, will dissociate 100%, meaning OH- ions are readily available. It is caustic, can burn skin, irrritate eyes and it is toxic if digested. It is also pretty reactive, and will produce heat when adding into water (enthalpy of solution) which may be very explosive
- HNO3--> this is pretty acidic, it is a strong acid, will dissociate 100%, meaning H+ ions are readily available, meaning it has pretty low pH values, such as 2-4.
It is caustic, can burn skin, irrritate eyes and it is toxic if digested. It is also pretty reactive, and will produce heat when adding into water (enthalpy of solution) which may be very explosive
- The product: HNO3+ NaOH is a solution of NaNO3 in water
NaNO3 is a salt, which is not toxic to the human, therefore, it represents low hazards to human health. In other cases, it is also very soluble so it will not form precipitates in the piping
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