Maximum Score:  11 Points

Question 3. Experimental Procedures

2 points total

Point Criteria:

• Allow 1 point for a correct testing method for an acid.
• Allow 1 point for a correct testing method for a base.

  Acceptable responses include:

  - Use phenolphthalein in all three solutions. (1 point)

  - Use litmus in all three solutions. (1 point)

  - Record and compare which are acid and base. (1 point)

  OR

  - Use blue litmus to test for acids. (1 point)

  - Use red litmus to test for bases. (1 point)

  OR

  - Use litmus paper to test for acids and bases. (2 points)

Question 5. Litmus and phenolphthalein Table

3 points total

Indicator	Solution A	Solution B	Solution C
Blue Litmus	Blue or same or no change	Red or pink	Blue or same or no change
Red Litmus	Red or same or no change	Red or same or no change	Blue or purple
Phenolphthalein	Clear, same or no change	Clear, same or no change	Pink

Point Criteria:

• Allow 1 point for correct data for solution A based on student plan in question #3.

• Allow 1 point for correct data for solution B based on student plan in question #3.

• Allow 1 point for correct data for solution C based on student plan in question #3.

Question 7. Identify Acidic Solution and Explain.

3 points total

Point Criteria:

• Allow 1 point for identifying the acidic solution as solution B.

  - Accept any student's response correctly based on his/her data.

  - Multiple answers receive no credit.

• Allow 2 points for an explanation relating student data to background information.

  - Solution B turned blue litmus red which indicates an acid.

  - Allow only 1 point if the student states the background information without relating it

  to his/her data.

Question 8. Identify Basic Solution and Explain.

3 points total

Point Criteria:

• Allow 1 point for identifying the basic solution as solution C.

  - Accept any student's response correctly based on his/her data.

  - Multiple answers receive no credit.

• Allow 2 points for an explanation relating student data to background information.

  - Solution C turned red litmus blue and/or phenolphthalein pink which indicates a base.

  - Allow only 1 point if the student states the background information without relating it

  to his/her data.

Student ID _______________________________	Scoring Form - Acid & Base Testing 2
Male or Female (circle one)

Circle the student's score for each question. Add the points for each question and write the total score at the bottom of the scoring form.

	Total Score _______________________________
	Highest possible score - 11 points