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Base your answers to questions 76 through 79 on the information below and on your knowledge of chemistry.


During a laboratory activity, a student places 25.0 mL of HCl(aq) of unknown concentration into a flask. The student adds four drops of phenolphthalein to the solution in the flask. The solution is titrated with 0.150 M KOH(aq) until the solution appears faint pink. The volume of KOH (aq) added is 18.5 mL.


76 What number of significant figures is used to express the concentration of the KOH (aq)?


77 Complete the equation in your answer booklet for the neutralization reaction that occurs during the titration.


HCl + KOH--> ________________


78 Determine the concentration of the HCl(aq) solution, using the titration data.


79 Describe one laboratory safety procedure that should be used if a drop of the KOH(aq) is spilled on the arm of the student.

Verified Answer :

Nellz01
  1. 3 significant figures
    77. KCl +H(little)2O
    78. 0.1M
    79. rinse it off with water or tell the teacher
    Hope this helps :)
pstnonsonjoku

The precaution taken when KOH is dropped on the arm of a student is to apply plenty water over the affected area.

What is titration?

The term titration has to do with a reaction between an acid and a base to form salt and water only.

In this reaction, we have; KOH + HCl -----> KCl + H2O. The concentration of KOH was expressed to two significant figures.

The concentration of HCl is obtained from;

0.150 M 18.5 mL 1/25.0 mL * 1 = 0.11 M

The precaution taken when KOH is dropped on the arm of a student is to apply plenty water over the affected area.

Learn more about titration:https://brainly.com/question/8832859

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