1. The mass of a 45.750 g piece of copper is measured three times on two different balances with the following results: Trial Balance 1 (grams) Balance 2 (grams) 45.747 45.745 1 45.76 45.77 45.74 3 45.748 a. Calculate the standard deviation for each set of measurements on each balance. Use the standard deviation formula shown on page 9 and show your work on the back of the page or on a separate sheet of paper. I encourage you to check your answer with a standard deviation calculator or on the internet. Balance 1 Balance 2 b. Which balance is more precise? Explain your answer. c. Which balance is more accurate? Explain your answer.

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.