Late Nite Labs Late Nite Labs macmillan learning COURSES LAB HANDBOOK SUPPORT CH

Question

Late Nite Labs Late Nite Labs macmillan learning COURSES LAB HANDBOOK SUPPORT CHINWE OKORIE PH INDICATORS e Choice Assignment - due 07/24/2016 SHOW LAB WORK QUESTION 11OF30 The pH of the test tube can be calculated by knowing the concentration of hydrogen ions (or hydronium mole cules) in solution. The pH=-log10(H+). For example, the 0.1 M stock of HCI has a pH=-log10(0:1)=1. Using the dilution (5 mL 0.1 HCl: 5 mL H2O), what is the pH of tube 1? Choose the closest answer. A. 1.3 B. 2.8 C. D. 4.2

Explanation / Answer

I have solved the first problem, for remaining problem data is not present i.e. what amount of HCl is getting mixed with water in other testubes

1)

M1V1 = M2V2

V1 = Volume of HCl = 5mL

V2 = Volume of HCl + Volume of water = 5mL + 5mL = 10 mL

(0.1)(5) = 10 * M2

M2 = 0.05

pH = -log[H+] = -log[0.05] = 2 - log(5) = 1 + log(2) = 1.3010

Correct answer is Option A

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