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.