The following table shows data from the titration of four 10.0 mL samples of a solution containing hydrochloric acid, HCl ag), using a 0.242 mol/L sodium hydroxide standard solution. Bromothymol blue is used as an indicator to detect when the endpoint is reached. Titration of 10.0 mL HCl(aq) With 0.242 mol/L NAOH(aq) Trial #1 #2 #3 #4 final burette reading (mL) 17.9 35.0 22.9 40.1 initial burette reading (mL) 0.3 17.9 5.9 22.9 volume of NaOH(ag) added (mL) colour at endpoint blue green green green a) Select the most consistent trials and calculate the average volume of titrant added. b) Calculate the concentration of the hydrochloric acid solution. Hint: Write a balanced chemical reaction first. You MUST show your work in the space provided. Then, record your final answers with the correct number of significant digits and the proper units.

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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.