125 Titrations lab(2)

125 Titrations lab(2) - Chem 125 Name: Partner: Partner:...

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Chem 125 Name: Partner: Partner: Titration Lab Report Sheet Part 1A: Titration of a Strong Acid with a Strong Base Formula of Acid: HCl Concentration of Acid: .1M Formula of Base: NaOH Concentration of Base: .05M 1. Write the molecular equation (including states of matter) for this reaction. HCl (aq) + NaOH (aq) => NaCl (aq) + H 2 O (l) 2. Write the net ionic equation (including states of matter) for this reaction. HCl (aq) +OH - => Cl - + H 2 O (l) 3. Calculate the volume of base required to reach the equivalence point of this titration. Remember that you used 3.0 mL of acid in this titration. C 1 V 1 =C 2 V 2 (.1M)(3.0 ml)=(.05M)( V 2 ) V 2 = 6 mL 4. At the equivalence point, is the solution expected to be (circle one): acidic basic neutral Explain your reasoning. I would suspect that this reaction should be neutral at equivalence point. It would be neutral because at equivalence point you have added the same amount of moles base to you moles of acid or vice versa. Create a graph in Excel (using your Logger Pro data) showing the relationship between pH and time of reaction. For the graphs in this report, choose the smooth line
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Chem 125 option (with no data points) in screen 1 of the Chart Wizard !! Attach this graph to your report. Create a second graph of your data showing the relationship between ∆pH and time (a first derivative plot). Attach this graph to your report. For ∆pH, have excel calculate the difference between two neighboring pH points vs. time. For example, if your first pH is in cell B1 and second is in B2, then cell C2 should have the equation =B2-B1. Then copy this formula all the way down. To figure out what the exact pH is at a particular point, hold your mouse over the graph so that the data points show up. 5. What is the exact pH of your solution at the equivalence point? Show or explain how you determined the pH point at the equivalence point. I found the top of the equilibrium curve and took half of that and found the pH value. It turned out to be at time 61 and it = 2.37571662 Part 1B: Titration of a Weak Acid with a Strong Base Name of Acid: Mateic Acid Concentration of Acid: .1M Formula of Base: NaOH Concentration of Base: .05M 1. Is the weak acid (circle one): monoprotic diprotic Explain how you determined this answer from your experimental data. It is diprotic because of the double equilibrium points in the graph. This acid has 2 H in it, the first curve is when it loses one and the second occurs when it loses the second. 2. If maleic acid could be represented by the formula H 2 Ma, write the two net ionic equations for maleic acid’s reaction with NaOH in the space below (be sure to include states of matter). Step 1:
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125 Titrations lab(2) - Chem 125 Name: Partner: Partner:...

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