June 2023 Chemistry Regents #82-85

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Question 82-85

 

 

 

In a laboratory activity, a student measures the pH values of four household liquids and distilled water, as shown in the table below. During the laboratory activity, appropriate safety equipment is used and safety procedures are followed.

Measured pH Values of Liquids Tested

Liquid Tested pH

aqueous ammonia

 11.9
black coffee 4.9
lemon juice 2.1
vinegar 3.3
distilled water 7.0

 

82  identify the liquid tested by the student that is most acidic.

Answer--> lemon juice

83 State the color of bromocresol green after the indicator is added to a sample of lemon juice.

Answer--> yellow (use table M)

84 Complete the equation in your answer book by writing the formula of the missing product in the reaction of aqueous potassium hydroxide and vinegar, acetic acid.

KOH  + HC2H3O2 --> KC2H3O2  + ____

Answer--> H2O  or HOH

85 Based on the pH value in the table, compare the concentration of hydronium ions to the concentration of the hydroxide ions in distilled water.

Answer--> they are equal

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