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13 June, 13:59

For each set of dilutions (bleach and mouthwash), the first tube contained a 1:11 dilution (0.5 mL of agent was added to 5.0 mL of nutrient broth). What was the dilution of the MIC for the mouthwash and the bleach? Hint: You will have to calculate the dilution of each tube 2 - 4.

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  1. 13 June, 16:34
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    Tube 2: 8.26 * 10^-3; Tube 4: 6.83 * 10^-5

    Explanation:

    In the serial dilutions for MIC test, the volume of nutrient broth in each tube should be equal: 5.0 mL. And the volume of agent in each dilution should also be similar: 0.5 mL.

    The serial dilutions was as following:

    Tube 1: 0.5/5.5 Tube 2: 0.5 mL of tube 1 was diluted with 5.0 mL broth. Then, the dilution of tube 2 is (1:11) * (1:11) = (0.5/5.5) * (0.5/5.5) = 1:121 = 8.26 * 10^-3 Tube 3: We perform the similar calculation. Thus, the result is 1:1331 = 7.51 * 10^-4 Tube 4: It is 1:14641 = 6.83 * 10^-5.
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