# Chapter 105: teaching, cards and source crosswalk

Draft batch, 2026-09-14. English and Japanese have the same two module IDs, paragraph sequence, examples and numerical conclusions. This is an authored correspondence check, not independent scientific or translation approval. All cards retain `review::pending`. Existing prose and the previous 210 paired note records are unchanged. Worked examples are original, not copied exam questions.

## Scope and source register

The [currently served AAMC outline](https://students-residents.aamc.org/media/9261/download), checked 2026-09-14, is internally copyright 2020. Relevant locations are printed page 65, stoichiometry; pages 66–67, category 5A solutions, acid–base equilibria and titration; and page 67, category 5B Lewis acid/base concepts. These are selected locations, not a complete crosswalk of those categories. No proprietary question is reproduced.

Scientific teaching references are OpenStax *Chemistry 2e*, by Paul Flowers, Klaus Theopold, Richard Langley and William R. Robinson, Rice University. The explanations, sequence, examples and bilingual cards here are newly composed; no original diagrams or question banks are redistributed.

- S1: [3.1 Formula Mass and the Mole Concept](https://openstax.org/books/chemistry-2e/pages/3-1-formula-mass-and-the-mole-concept).
- S2: [3.3 Molarity](https://openstax.org/books/chemistry-2e/pages/3-3-molarity).
- S3: [3.4 Other Units for Solution Concentrations](https://openstax.org/books/chemistry-2e/pages/3-4-other-units-for-solution-concentrations).
- S4: [4.3 Reaction Stoichiometry](https://openstax.org/books/chemistry-2e/pages/4-3-reaction-stoichiometry).
- S5: [4.4 Reaction Yields](https://openstax.org/books/chemistry-2e/pages/4-4-reaction-yields).
- S6: [14.2 pH and pOH](https://openstax.org/books/chemistry-2e/pages/14-2-ph-and-poh).
- S7: [14.3 Relative Strengths of Acids and Bases](https://openstax.org/books/chemistry-2e/pages/14-3-relative-strengths-of-acids-and-bases).
- S8: [14.6 Buffers](https://openstax.org/books/chemistry-2e/pages/14-6-buffers).
- S9: [14.7 Acid–Base Titrations](https://openstax.org/books/chemistry-2e/pages/14-7-acid-base-titrations).

These references were checked during the batch. Individual extrapolations and author-derived numerical cases still require editorial review. Precision/calibration and ideal particle counting are bridging explanations, not claimed to be exhaustive coverage of the above sources.

## Objective-level teaching map

Each number below is the final four-digit component of a stable paired card ID. Prefixes are `IMF-105-01-` and `IMF-105-02-`; language exports add `-en` or `-ja`. Each row maps a single authored retrieval objective to the same location in both language lessons. Location names below are the English subsection names; Japanese subsections occur in the same order. All rows are present-but-unreviewed, not complete syllabus claims.

### Module 105-1

| ID | Learner action | Teaching location | Reference or derivation |
|---|---|---|---|
| 0001 | Identify the entity counted by a mole | From mass to amount | S1 |
| 0002 | Convert mass to amount | From mass to amount | S1; original calculation |
| 0003 | Compare entity counts at equal mass | From mass to amount | S1 |
| 0004 | Infer molecular formula from empirical composition and molar mass | From mass to amount | Original ratio calculation; AAMC p65 |
| 0005 | Choose final solution volume for molarity | Concentration and dilution | S2 |
| 0006 | Calculate conserved amount during dilution | Concentration and dilution | S2; original calculation |
| 0007 | Recognise when reaction invalidates simple dilution | Concentration and dilution | S2/S4; conservation reasoning |
| 0008 | Combine successive dilution factors | Concentration and dilution | Original arithmetic |
| 0009 | Convert explicitly defined mass/volume percent | Concentration and dilution | S3; original unit conversion |
| 0010 | Distinguish the denominator of molality | Concentration and dilution | Concentration-definition bridge |
| 0011 | Distinguish coefficients from formula subscripts | Balancing before calculating | S4 |
| 0012 | Interpret reaction coefficients as amount ratios | Balancing before calculating | S4 |
| 0013 | Determine a limiting input using coefficient-normalised amounts | Balancing before calculating | S5; original ethanol example |
| 0014 | Calculate product amount from the limiting input | Balancing before calculating | S4/S5; original calculation |
| 0015 | Calculate actual/theoretical percentage yield | Predicted conversion versus measured recovery | S5; original calculation |
| 0016 | Explain why low recovery does not identify its cause | Predicted conversion versus measured recovery | S5 |
| 0017 | Investigate apparently excessive product yield | Predicted conversion versus measured recovery | Mass-conservation reasoning |
| 0018 | Separate an ideal yield ceiling from kinetics/equilibrium | Predicted conversion versus measured recovery | S5; model-limit explanation |
| 0019 | Count ideal dissociated particles from a formula | Species, particles, and reporting discipline | Formula-counting bridge; ideality explicitly assumed |
| 0020 | Convert ionic amount to charge equivalents | Species, particles, and reporting discipline | Charge-counting definition |
| 0021 | Use density to connect mass percent and solution volume | Concentration and dilution | S3; original calculation |
| 0022 | Distinguish repeatability from freedom from calibration bias | Predicted conversion versus measured recovery | Measurement-reasoning bridge |

### Module 105-2

| ID | Learner action | Teaching location | Reference or derivation |
|---|---|---|---|
| 0001 | Distinguish proton donor and acceptor | Definitions and logarithmic measurements | AAMC p66; S7 |
| 0002 | Identify the proton/charge difference in a conjugate pair | Definitions and logarithmic measurements | S7 |
| 0003 | Identify the electron-pair acceptor in the Lewis definition | Definitions and logarithmic measurements | AAMC p67 |
| 0004 | Define pH using activity and recognise the concentration approximation | Definitions and logarithmic measurements | S6; activity qualification |
| 0005 | Translate a pH difference into an activity ratio | Definitions and logarithmic measurements | S6; logarithmic derivation |
| 0006 | Distinguish neutrality from a temperature-independent pH number | Definitions and logarithmic measurements | S6/S7 |
| 0007 | Interpret acid strength without confusing it with concentration | Strength is not concentration | S7 |
| 0008 | Form the weak-acid depletion equation | Strength is not concentration | S7 |
| 0009 | Check the small-depletion approximation after solving | Strength is not concentration | S7; original numerical comparison |
| 0010 | Recognise the failure of ignoring water for extremely dilute acid | Strength is not concentration | Water/charge-balance derivation |
| 0011 | Identify the buffer reserve consumed by added acid | Buffers as finite chemical reserves | S8 |
| 0012 | Use post-reaction rather than initial buffer amounts | Buffers as finite chemical reserves | S8 |
| 0013 | Calculate the pH after a finite acid addition | Buffers as finite chemical reserves | S8; original numerical case |
| 0014 | Distinguish buffer pH from capacity | Buffers as finite chemical reserves | S8 |
| 0015 | Predict the approximate effect of ideal buffer dilution | Buffers as finite chemical reserves | S8; fixed-volume qualification |
| 0016 | Distinguish equivalence from an observed endpoint | Titration as a sequence of different problems | S9 |
| 0017 | Explain the half-equivalence pH/pKa relation | Titration as a sequence of different problems | S9 |
| 0018 | Determine equivalence volume from monoprotic stoichiometry | Titration as a sequence of different problems | S9; original calculation |
| 0019 | Explain basic pH at weak-acid/strong-base equivalence | Titration as a sequence of different problems | S9 |
| 0020 | Predict a simple group's protonation ratio | Connecting protonation with biological reasoning | Equilibrium-ratio derivation; whole-protein limitation |
| 0021 | Derive a conjugate base constant from acid and water constants | Titration as a sequence of different problems | S7/S9 |
| 0022 | Mix ideal strong-acid concentrations before taking a logarithm | Titration as a sequence of different problems | Original concentration/logarithm calculation |

## Review boundaries and next work

Numerical regression checks cover amounts, dilution, density, balanced ethanol mass, yield, weak-acid exact/approximate solutions, buffer additions, equivalence volumes, base hydrolysis and strong-acid mixing. They do not prove every prose claim or Japanese nuance. Card exports are structurally validated, but real Anki import/reimport/scheduling preservation and native package testing remain pending.

Module 105-1 has 1,293 English words and 3,495 non-whitespace Japanese characters; 105-2 has 1,344 words and 3,578 characters. At an assumed 130–150 English words per minute the estimates are about 8.6–9.9 and 9.0–10.3 minutes. An illustrative 350–450 Japanese characters per minute gives 7.8–10.0 and 8.0–10.2 minutes. Japanese characters are not spoken morae, and numbers can expand substantially when spoken. These are planning ranges, not measured audio lengths; calibrate the selected ElevenLabs voice before final segmentation. Existing module IDs are preserved.

Remaining work includes empirical-composition measurement, redox balancing and oxidation states, gas laws, general equilibrium/solubility, thermodynamics, kinetics, structural chemistry, organic chemistry, weak-base and polyprotic worked cases, additional application questions and independent review. Existing clinical acid–base chapter 19 is preserved; 105 supplies prerequisite calculation skills rather than replacing clinical interpretation. Tables and URLs in this companion are not inserted into narration.

日本語の位置付け：本章は定量化学と酸塩基計算の基礎を追加する草稿であり、MCATの化学範囲全体を完了したものではない。英日で例題、数値、条件、注意点を対応させたが、独立した内容・翻訳の確認は未完了である。読み上げ時間は仮定に基づく範囲で、実音声による測定ではない。カードの構造確認と、Anki上での実際の取り込み・更新確認を区別する。