Free Printable WorksheetScienceGrade 8Science CurriculumPS.8.26

8.26 Acids, Bases and Indicators (Introductory) Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.26 Acids, Bases and Indicators (Introductory). Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Acids, Bases and Indicators (Introductory) - Which option best distinguishes acids and bases using common indicators and everyday contexts; connect to hydrogen ion concentration qualitatively? (NGSS MS Connections (local frameworks); SEP: Obtaining/Evaluating Information; CCSS RST.6–8.4; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 8.26 Acids, Bases and Indicators (Introductory) skill assessments:

Problem 1Difficulty: Mastery

You have three unlabeled clear solutions: one acid, one base, and one neutral. You can use only ONE drop of phenolphthalein total and ONE piece of BLUE litmus paper total. Which strategy will identify all three correctly?

AAdd phenolphthalein to each solution until one turns pink.

BUse the blue litmus paper on all three solutions one after another.

CUse phenolphthalein on the neutral solution first to save time.

DPut one drop of phenolphthalein into a small sample of one solution. If it turns pink, that one is the base; then use the single blue litmus paper on a second solution—if it turns red, that one is the acid and the remaining one is neutral (if it stays blue, that one is neutral and the remaining one is acid).

Solution & Explanation:Phenolphthalein identifies a base by turning pink. After you find the base, only acid and neutral remain. Blue litmus turns red only in an acid; if it doesn’t change, that solution is neutral and the remaining unlabeled one must be the acid.

Problem 2Difficulty: Mastery

A student mixes two solutions and observes that the pH moves from 10 down to 8. The student concludes, “The mixture must now be acidic.” "Which statement best evaluates this conclusion?,A. Correct—any decrease in pH makes a solution acidic. | B. Correct—pH 8 is acidic because it is lower than 10. | C. Incorrect—pH 8 is still basic; it just has higher H⁺ than pH 10. | D. Incorrect—bases always stay at pH 14 when mixed.,C,pH 8 is still above 7

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Problem 3Difficulty: Mastery

A sample’s pH is 7. After adding a base, its pH becomes 9. Compared with the original sample, the final sample’s H⁺ concentration is approximately:

A10× higher

B100× lower

C9× lower

D2× higher

Solution & Explanation:An increase from pH 7 to pH 9 is 2 pH units, which corresponds to about 10² = 100 times lower H⁺ concentration. Adding base reduced H⁺.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard PS.8.26 (Classify acids and bases and interpret indicator color changes.).