Free Printable WorksheetScienceGrade 11Science CurriculumAP Chem Unit 8; NGSS HS-PS1-2 and HS-PS1-7 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.1

11.109 Polyprotic Acids and Amphiprotic Species Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.109 Polyprotic Acids and Amphiprotic Species. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Polyprotic Acids and Amphiprotic Species: Analyze species that donate or accept more than one proton and interpret stepwise ionization or amphiprotic behavior. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks - AP Chem Unit 8; NGSS HS-PS1-2 and HS-PS1-7 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.1 - Polyprotic Acids and Amphiprotic Species Chemistry Standards Crosswalk: National: AP Chem Unit 8; NGSS HS-PS1-2 and HS-PS1-7 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.1. State frameworks: TX TEKS 112.43(c)(12); FL SC.912.P.8.8 and acid-base benchmarks; MA chemistry acid-base standards; GA and VA acids/bases/solutions standards; CA/NY/NJ chemistry connections.

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

Chemistry

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 11.109 Polyprotic Acids and Amphiprotic Species skill assessments:

Problem 1Difficulty: Mastery

A student says, "HA- cannot be amphiprotic because it has a negative charge." Which correction is best?

AAny negative ion is unable to react with acids.

BOnly neutral molecules can be amphiprotic.

CHA- must donate electrons instead of protons.

DA negative charge can favor H+ acceptance, and an attached H can still be donated.

Solution & Explanation:Charge does not prevent amphiprotic behavior. HA- can accept H+ to form H2A and donate H+ to form A²-.

Problem 2Difficulty: Mastery

Which statement best distinguishes sulfuric acid, H2SO4, from carbonic acid, H2CO3, in stepwise acid-base reasoning?

AH2SO4 is monoprotic, while H2CO3 is triprotic.

BH2SO4 cannot form an amphiprotic intermediate, but H2CO3 can form three.

CH2SO4 has a very strong first ionization, while H2CO3 has weak stepwise ionizations.

DH2SO4 and H2CO3 must have identical Ka values because both begin with H2.

Solution & Explanation:Both acids are diprotic, but their ionization strengths differ. H2SO4 is strong in its first step, whereas carbonic acid is weak and stepwise.

Problem 3Difficulty: Mastery

Use the titration curve shown. A 25.0 mL sample of H2A reaches its first equivalence point at 30.0 mL of 0.100 M NaOH. What is the molarity of H2A?

A0.0600 M

B0.120 M

C0.240 M

D0.0300 M

Solution & Explanation:At the first equivalence point, moles H2A equal moles OH-. Moles OH- = 0.0300 L x 0.100 M = 0.00300 mol. Acid molarity = 0.00300 mol / 0.0250 L = 0.120 M.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard AP Chem Unit 8; NGSS HS-PS1-2 and HS-PS1-7 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.1 (National: AP Chem Unit 8; NGSS HS-PS1-2 and HS-PS1-7 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.1. State frameworks: TX TEKS 112.43(c)(12); FL SC.912.P.8.8 and acid-base benchmarks; MA chemistry acid-base standards; GA and VA acids/bases/solutions standards; CA/NY/NJ chemistry connections.).