Titration is also commonly used in the food industry particularly in making

Titration is also commonly used in the food industry

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Titration is also commonly used in the food industry particularly inmaking products like cola(what we use in our experiment) and other drinks.III. Data and ResultsTable 1: NaOH Standardization
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Mass of KHP (g)Moles KHPVolume of NaOH Added (mL)Concentration NaOH (M)Trial 10.0653.18 x10-429.20.0109Trial 20.0653.18 x10-431.80.0100Average Concentration (M)0.0105B. Titration of Cola SampleTable 2. Initial Parameters of TitrationVolume ofCola (ml)20Initial pH2.77Table 3. Data for Titration ofCola6 ptsVolume oftitrant (ml)pHDpHDV (ml)DpH/DVAvg. V of titrant(ml)02.760.000.000.000.0012.780.021.000.020.5022.860.081.000.081.5032.90.041.000.042.504.13.050.151.100.143.5553.230.180.900.204.5563.260.031.000.035.5073.410.151.000.156.5083.39-0.021.00-0.027.5093.50.111.000.118.50103.610.111.000.119.50113.820.211.000.2110.5011.94.020.200.900.2211.45134.130.111.100.1012.4514.24.40.271.200.2313.6015.14.630.230.900.2614.65165.020.390.900.4315.5517.15.180.161.100.1516.55185.260.080.900.0917.55195.440.181.000.1818.5019.55.670.230.500.4619.25215.790.121.500.0820.25
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22.15.990.201.100.1821.55235.990.000.900.0022.55246.230.241.000.2423.50257.080.851.000.8524.5025.57.780.700.501.4025.2525.98.170.390.400.9825.7026.58.480.310.600.5226.2027.18.550.070.600.1226.8027.58.690.140.400.3527.30288.890.200.500.4027.7528.59.040.150.500.3028.25299.10.060.500.1228.7529.69.110.010.600.0229.30309.140.030.400.0829.80319.180.041.000.0430.5031.59.220.040.500.0831.25329.21-0.010.50-0.0231.75339.330.121.000.1232.50349.360.031.000.0333.5034.59.360.000.500.0034.2535.59.410.051.000.0535.0036.59.430.021.000.0236.0037.69.440.011.100.0137.0538.59.650.210.900.2338.0539.59.54-0.111.00-0.1139.0040.59.47-0.071.00-0.0740.0041.59.690.221.000.2241.00429.950.260.500.5241.75439.950.001.000.0042.50449.93-0.021.00-0.0243.5044.510.090.160.500.3244.25Plot 1. Titration Curve with Approximate First DerivativeTable 3. 5 pts
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Determination of KaValuesKGraphical AnalysisLiterature ValuesV1/2(ml)pKaKapKaKaKa16.53.413.89E-04 2.127.5x10-3Ka219.255.67 2.14E-06 7.216.2x10-8Ka1calculatedfrom initialpH Sample Calculation 1: Molarity of NaOHKHP(aq)+NaOH(aq)KNaP(aq)+H2O(l)0.065g KHP(1 mol/204.2 g)(1 mol NaOH/1 mol KHP)=3.18×10-4mol NaOH3.18×10-4mol NaOH(1 mol NaOH/0.0318L)=0.0100M NaOHSample Calculation 2: Concentration of Phosphoric Acid in Cola SampleH3PO4(aq)+NaOH(aq)H2O(l)+H2PO4-(aq)+Na+(aq)nbase= 0.0100M NaOH x 0.01325L = .0001325 mol NaOH.0001325 molNaOH x 1molH3PO4= .0001325 molH3PO41molNaOHM = n / V = {.0001325 mol H3PO4} / {0.020L}= .006625 M H3PO4Sample Calculation 3: Ka1 calculated non-graphically, from initial pH and [H3PO4]Sample Calculation 4: Percent dissociation of H3PO4IV. DiscussionThe objectives of this lab were to standardize a sodium hydroxide solution via titration using a visual indicator. We also had to conduct a pH titration of phosphoric acidin a cola drink in order to determine the concentration of phosphoric acid in cola drink and determine the acid dissociation constants of phosphoric acid. We then determined theextent of ionization of phosphoric acid. We first standardized a sodium hydroxide solution by titrating the solution with about 0.065grams of KHP. We performed this twicefor accuracy. For the next part, we obtained pH values at different times in the dissociation of phosphoric acid by titrating cola with sodium hydroxide to calculate the Ka1and Ka2.
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In Part A we twice measured out .065grams of KHP and added it to 20mL of water with phenophalein indicator. We then added .01 M NaOH to the solution using a buret until the solution changed color to indicate when the solution has reached the equivalence point. For our first trial it reached the equivalence point after 29.1 mL of
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  • Spring '11
  • Dr.JohnZhang
  • pH, Equivalence point, Sodium hydroxide, KHP

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