Mole Ratios Lab Report
Determination of the mole ratio of a chemical reaction
The method of continuous variations is a means of determining the stoichiometric mole ratio of the reactants in a chemical reaction. The stoichiometric ratio, as given by the coefficients in the balanced chemical equation, represents the ratio at which chemicals must be combined to produce all product with no excess reactant. Since there is no “wasted” reactant, the maximum amount of product is made for the given amount of both reactants.
In the method of continuous variations, several trials are performed. In each trial, there is a fixed amount of total reactant (measured by moles or volume or mass, etc.), but with the two reactants mixed together in different ratios. Some measure of the amount of product is made for each trial (volume of gas produced, mass of …show more content…
d) How many values were used to plot your “up” line? How many values were used to plot your “down” line? Are these enough values to plot a good line?
2. What single temperature change should be recorded if 10 mL of solution A at 20°C is mixed with 10 mL of solution B at 24.0°C and the final temperature reaches 28.0°C?
3. What single temperature change should be recorded if 10 mL of solution A at 20°C is mixed with 30 mL of solution B at 24.0°C and the final temperature reaches 28.0°C?
4. List four dependent variables that are often used for the method of continuous variations.
5. (Skip this question if already covered in another lab) Two thermometers are placed in a sample of water. The first one reads 50.2°C and the second reads 50.9°C. If the second thermometer is placed in a new sample and reads 84.5°C, what will the first thermometer read in the same sample?
Equipment: Graduated cylinders (10-50 mL), 2 thermometers, small styrofoam cup (lid optional)
The method of continuous variations is a means of determining the stoichiometric mole ratio of the reactants in a chemical reaction. The stoichiometric ratio, as given by the coefficients in the balanced chemical equation, represents the ratio at which chemicals must be combined to produce all product with no excess reactant. Since there is no “wasted” reactant, the maximum amount of product is made for the given amount of both reactants.
In the method of continuous variations, several trials are performed. In each trial, there is a fixed amount of total reactant (measured by moles or volume or mass, etc.), but with the two reactants mixed together in different ratios. Some measure of the amount of product is made for each trial (volume of gas produced, mass of …show more content…
d) How many values were used to plot your “up” line? How many values were used to plot your “down” line? Are these enough values to plot a good line?
2. What single temperature change should be recorded if 10 mL of solution A at 20°C is mixed with 10 mL of solution B at 24.0°C and the final temperature reaches 28.0°C?
3. What single temperature change should be recorded if 10 mL of solution A at 20°C is mixed with 30 mL of solution B at 24.0°C and the final temperature reaches 28.0°C?
4. List four dependent variables that are often used for the method of continuous variations.
5. (Skip this question if already covered in another lab) Two thermometers are placed in a sample of water. The first one reads 50.2°C and the second reads 50.9°C. If the second thermometer is placed in a new sample and reads 84.5°C, what will the first thermometer read in the same sample?
Equipment: Graduated cylinders (10-50 mL), 2 thermometers, small styrofoam cup (lid optional)