Briefly explain the following terms as they relate to this experiment: a. end po

Question

Briefly explain the following terms as they relate to this experiment: a. end point b. standard solution c. phenolphthalein The molar concentration of a sample of hydrochloric acid (HCl) was studied by titration with standard 0.600 M NaOH. The following information was collected in the experiment. Complete the remainder of the data table. Volume of NaOH Moles of NaOH Moles of HCl M of HCl Mean M of HCl From the procedure, write the balanced chemical equation for the neutralization reaction you will be performing in lab (NOT from #2).

Explanation / Answer

1. Explanation

a. End point : The point in acid-base titration when no more titrant addition is required. The point is seen by a color change of an indicator present in solution.

b. Standard solution : A solution whose concentration is known accurately and it doesn't change.

c. Phenolphathalein : An indicator used in acid-base titration. It is colorless in acid medium and pink in basic medium.

2. Reaction : HCl + NaOH ---> NaCl + H2O

Molarity = moles/L

moles of NaOH = M of NaOH x Volume of NaOH

M of HCl = moles of NaOH/Volume of HCl

                                                        Trial 1                    Trial 2

Volume of NaOH (ml)                      30.0                        50.0

M of NaOH (M)                                 0.6                          0.6    

moles of NaOH (mmol)                    9.42                       16.08

M of HCl (M)                                    0.314                     0.3216

Mean M of HCl (M)                          0.318

3. Balaned neutralizaton reaction : HCl + NaOH ---> NaCl + H2O

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