Titration curves (set 1 of 2)
Calculating titration endpoint volumeUsed the colorimeter titration program to find the endpoint and corresponding EDTA volume. experimental ppm = EDTA vol (uL)/sample vol (mL) Sample volume = 2 mL
ppm CaCO3 | Endpoint EDTA volume (uL) Trial 1 | Endpoint EDTA volume (uL) Trial 2 | Avergage Endpoint EDTA volume (uL) | Experimental CaCO3 ppm | 10 ppm | 35.41 | 30.29 | 32.85 | 16.43 ppm | | 25 ppm | 64.71 | 60.38 | 62.55 | 31.28 ppm | | 50 ppm | 105.51 | 108.70 | 107.11 | 53.55 ppm | | 75 ppm | 172.00 | 169.67 | 170.84 | 85.42 ppm | | 100 ppm | 205.13 | 209.26 | 207.20 | 103.6 ppm | | 125 ppm | 254.92 | 257.86 | 256.39 | 128.20 ppm | | 150 ppm | 300.17 | 310.82 | 305.50 | 152.75 ppm | | 175 ppm | 369.55 | 368.24 | 368.90 | 184.45 ppm | | 200 ppm | 429.61 | 425.82 | 427.72 | 213.86 ppm |
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Plotting the expected endpoint volume versus experimental endpoint volume:
ConclusionExperimental data pretty close to the expected data. Consistently higher than theoretical. Could probably be improved by taking more data points around the endpoint. |