Question

For this exercise, you can simulate the described conditions by changing the values in the Run Experiment tool, under the Experiment tab, in the simulation.

The temperature changes can be used to qualitatively determine whether an unknown acid is a weak or strong acid by running several neutralization reactions and comparing temperature results from the unknown acids with those of a known strong acid and known weak acid.

In the simulation, run four neutralization experiments between 0.120 mol of each acid and 0.120 mol of the strong base sodium hydroxide (NaOH), which can be achieved by using a volume and molarity of 50 mL and 2.4 M , respectively. For the standard strong acid, hydrochloric acid (HCl) can be used, and for the standard weak acid, nitrous acid (HNO2) can be used. The unknown acids are labeled "Unknown acid I" and "Unknown acid II" in the simulation. Use the experimental results to predict the type of acid for both unknown acids and explain your answer in the statements below.

Word Blank:

• the same as
• weak
• greater than
• strong
• less than

• When 0.120 m o l of the standard strong acid neutralizes 0.120 m o l of the strong base, the final temperature is_______________ the final temperature after the standard weak acid neutralizes the strong base.

• When 0.120 m o l of Unknown acid I acid neutralizes 0.120 m o l of the strong base, the final temperature is closest to the result of the neutralization between the standard____________________ acid and strong base.

• When 0.120 m o l of Unknown acid II acid neutralizes 0.120 m o l of the strong base, the final temperature is closest to the result of the neutralization between the standard--------------- acid and strong base.

Answer 1

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