Chapter 9-Techniques to C Chapter 9-Techniques × + LTX v mycourses purdue.edu/bb

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Chapter 9-Techniques to C Chapter 9-Techniques × + LTX v mycourses purdue.edu/bbcswebdav/pid-10120423 dt content-rid-44799740 1/courses/1810 mtowns 1/Chapte %209%20-%20Tec lU Answer these in your laboratory notebook that is at the end of your laboratory textbook. Be sure to put the fold-over back cover under the pink page so that your writing on the green pages goes through to the pink pages 1. Review Appendices B and C 2. Determine the volume of solution dispensed from the buret pictured if the initial buret reading was 2.38 mL Initial Volume 2.38 3. A student finds that 27.60 mL of 0.1122 M NaOII are required to completely neutralize 25.00 mL of H SO4 a. Write a balanced chemical equation for this neutralization. b. Determine the concentration (M) of the acicd. 4. Given the graph below; answer the following questions: a. What is the equation of the best-fit line or trendline? 8:39 PM Type here to search 11/5/2017

Explanation / Answer

Ans 2. Final burette reading is ...23.8 mL

Thus total volume used = 23.80 mL - 2.38 mL = 21.42mL

Ans. 3a Moles of NaOH = Molarity x volume = 0.1122 M x 0.02760 L = 0.0031 moles

2NaOH + H2SO4 ====> 2NaCl + 2H2O

2 moles 1 mole

According to balance equation 2 moles of NaOH reacts with 1 mole of H2SO4 for complete neutralization.

Moles of H2SO4 that will neutralize by 0.0031 moles of NaOH = 0.0031 /2 = 0.00155 moles

Molarity of H2SO4 = Moles / Volume = 0.00155 moles / 0.025 L = 0.062 M

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