Data Table A. Stock solution concentrations of HCl, H 3 PO 4 and NaOH Data Table

Question

Data Table A. Stock solution concentrations of HCl, H3PO4 and NaOH

Data Table B. Temperature data for combinations of NaOH and HCl(aq)

Data Table C. Temperature data for combinations of NaOH and H3PO4

In-Lab Question 1. Show your calculation for the mmol of base and the mmol of acid in mixing experiment 1. (The values you enter for your sample calculation should exactly match the corresponding values you entered above.)
1.5   mmol / mL HCl × 10   mL HCl = 15   mmol HCl

1.5   mmol / mL NaOH × 20   mL NaOH = 30   mmol NaOH

In-Lab Question 2. Construct a reaction table for experiment #1, the addition of 20. mL each of NaOH and H2O with 10. mL of HCl. (All entries should be in millimoles.)

In-Lab Question 3. For experiment #1, which is the limiting reagent?

NaCl

NaOH    

HCl

H2O

In-Lab Question 4. Which experiments from 1-3 have the same change in temperature? (Select all that apply.)

1

2

3

In-Lab Question 5. For the experiments from 1-3 with the same temperature change, what other parameters are the same? (Select all that apply.)

mmol HCl

total mL of solution

mL H2O

mmol NaOH

initial concentration of HCl

initial concentration of NaOH

Additional Question 6. Which experiments from 4-6 have the same change in temperature? (Select all that apply.)

4

5

6

Additional Question 7. For the experiments from 4-6 with the same temperature change, what other parameters are the same? (Select all that apply.)

mmol H3PO4

mmol NaOHmL

H2Ototal mL of solution

initial concentration of NaOH

initial concentration of H3PO4

Explanation / Answer

In-LabQ. 2

Table for Expt. 1

                       HCl(aq)    +       NaOH(aq)   ----------->    NaCl(aq)      +         H2O(l)

initial              15mmol               30mmol                             0                            -

change           15mmol              15 mmol                        15 mmol                    -

Final                  0                      15mmol                         15 mmol                    -

In-Lab Question 3. For experiment #1, the limiting reagent in the reaction is,

HCl

In-Lab Question 4. Among the experiments from 1-3, same change in temperature is for,

2

3

In-Lab Question 5. For the experiments from 1-3 with the same temperature change, other parameters which are same are,

total mL of solution

mmol NaOH

initial concentration of NaOH

Additional Question 6. Among experiments from 4-6, same change in temperature is seen for,

None

Additional Question 7. For the experiments from 4-6 with the same temperature change, what other parameters are the same? (Select all that apply.)

None

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