Chem Lab #5

Chem Lab #5 - Introduction: This lab is an imitation of...

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Introduction : This lab is an imitation of another experiment done in 1989 involving cold fusion. In the original experiment, someone intentionally “spiked” the sample with tritium. The purpose of this lab, is to determine the molarity of the HCl solution in order to identify which sample of HCl (hydrochloric acid) solution has been “spiked.” This is done by performing a series of titrations. Titrations involve adding a liquid (acid or base) of known strength and measuring the volume necessary to convert the substance to the opposite form. From this, the molarity of the solution can be calculated. The first titration involves standardizing the NaOH (sodium hydroxide) to find the molarity of NaOH. The second titration determines the molarity of the HCl. Both molarity calculations are based on the balanced equation: NaOH (aq) + KHP (aq) H 2 O + KNaP (aq) which has a one to one ratio. An acid- base indicator called phenolphthalein was used to determine when the endpoint was reached. The endpoint or equivalence point is when the amount of acid equals the amount of base. By comparing these calculated values with the actual molarities, the
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Chem Lab #5 - Introduction: This lab is an imitation of...

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