1. ) On graph paper, plot the millilitres of reactant # 1 versus volume of precipitate for each reaction. For the Cu chloride graph, pull the two best-fit consecutive lines through the information points and find their point of intersection.

Copper: PO4 stoichiometric ratio = 3:2
Balanced Equation = 3CuCl2 + 2Na3PO4 Cu3 ( PO4 ) 2 + 6NaCl

2. ) For the Fe nitrate graph, pull the best-fit line through the rise informations, and a smooth curve through the descending informations. Determine their intersection point. From the point of intersection, find the stoichiometric mole ratio for each reaction. Write out the correct balanced equation for each reaction.

Fe: OH stoichiometric ratio = 2:5
Balanced equation = 2Fe ( NO3 ) 3 + 3OH Fe2O3 + 3H ( NO3 )

3. ) Explain how this method allows you to happen the mole ratio of reactants.

This method allows you to happen the mole ratio of the reactants because by charting the sum of precipitate vs. volume of reactant # 1 shows you where you had the optimal sum of precipitate made when maintaining a steady volume of the reactants.

4. ) Why must you maintain a changeless volume of reactants?

You must maintain a changeless volume of the reactants because you need to cognize which mole ratio of the reactants produced the most hasty over a changeless volume of the different solutions.

5. ) Is it necessary that the concentrations of the two solutions be the same?

Yes, it is necessary that the concentrations of the two solutions must be the same so the ratio of H2O to the Reactant stays the same and doesn’t impact your informations by holding different ratios of H2O.

6. ) What is meant by the term restricting reagent?

The term restricting reagent means the reactant that ran out foremost in the reaction.

7. ) Which reactant is the restricting reagent along the upward inclining line of your graph? Which is the restricting reagent along the downward sloping line?

The modification reagents along the upward sloping lines of my graphs would be Fe ( NO3 ) 3 and CuCl2 because they are what ran out foremost because there is less of them of the whole solution before the extremum of the graph. OH and Na3PO4 are the confining reagents along the downward sloping lines because there is less of them of the whole solution after the extremum on the graphs.

8. ) Why is it more accurate to utilize the point of intersection of the two lines to happen the mole ratio instead than the ratio associated with the greatest volume of precipitate?

It is more accurate to utilize the point of intersection of the two lines to happen the mole ratio instead than the ratio associated with the greatest volume of precipitate because in your lab you may non hold tried the best mole ratio but crossing the lines would state you what it would be.

Decision
This labs intent was to find the stoichiometry of Fe ( NO3 ) 3+ NaOH and CuCl2 + Na3PO4. We did this by pouring different mole ratios of each reactant to reactant in 7 different graduated cylinders all consisting of the same volume. Then we measured the volume of precipitate of each cylinder and graphed volume of reactant # 1 vs. volume of precipitate for each reaction. In our graphs it showed us the lifting up to a extremum the traveling back down. I, so drew the line of best tantrum threw the go uping informations and falling informations, and were the lines intersect would be our optimal ratio.

For these peculiar reactions our soaps point was our optimal mole ratios, If we did non blend that soap ratio it wouldn’t be on our graph so that is why I used lines of best tantrum because it would demo you were your optimal mole ratio would be. In my Fe ( NO3 ) 3 + NaOH graph/data it shows another leap back up from cylinder 6 to cylinder 7 which does non do sense the falling informations should non leap back up. Some possible beginnings of mistake that might hold caused this could be person acquiring cylinders 6 and 7 assorted up or non mensurating the right sums of solutions to be assorted together. After making all this I was able to find the balanced equations 2Fe ( NO3 ) 3 + 3OH Fe2O3 + 3H ( NO3 ) and 3CuCl2 + 2Na3PO4 Cu3 ( PO4 ) 2 + 6NaCl.