STEM PRACTICE AND EVIDENCE WORKBENCH
Calculate final concentration from stock concentration and transferred and final volumes, then audit direction claims.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
Conserved solute gives C1V1 equals C2V2, so final concentration C2 equals stock concentration C1 times transferred volume V1 divided by final total volume V2. A larger final volume produces dilution. Supported means both the calculated concentration and direction agree with the bounded model. A conflict may reflect wrong final volume, inverted ratio, mixed units, or an unsupported assumption. Review apparatus, uncertainty, safety, and the actual protocol.
Confirm the question, source, units, notation, response coding, model assumptions, and review threshold. Keep an unchanged copy of the original evidence.
Run the worked example, inspect every intermediate row, and compare it with a hand calculation, diagram, representation, or approved subject method.
Record the method, assumptions, units, classifications, and flagged rows. Verify the editable report independently before educational or laboratory use.
How to interpret the result
Use for a bounded dilution check after quantities and units are known. It does not infer a stock recipe, handle reactions, mixing volume changes, serial uncertainty, hazardous preparation, clinical dosing, or laboratory authorization.
Two molar stock transferred as ten millilitres and diluted to 100 millilitres becomes 0.2 molar. A 1.5 stock transferred as 20 and completed to 60 becomes 0.5. Equal transferred and final volumes remain unchanged. The final learner value misses a threefold dilution.
Conserved solute gives C1V1 equals C2V2, so final concentration C2 equals stock concentration C1 times transferred volume V1 divided by final total volume V2. A larger final volume produces dilution.
Supported means both the calculated concentration and direction agree with the bounded model. A conflict may reflect wrong final volume, inverted ratio, mixed units, or an unsupported assumption. Review apparatus, uncertainty, safety, and the actual protocol.
Do not use solvent-added volume as final volume, invert V1 and V2, mix millilitres and litres inconsistently, assume concentration stays constant, round early, or use this classroom check to prepare hazardous or clinical solutions.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, or replace teacher, laboratory, and safety judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid personal information and retain authoritative records only in the approved school system.
No. It describes entered evidence under one disclosed rule. Review reasoning, uncertainty, access, and several evidence sources.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow course and academic-integrity rules.
YOUR NIRMION
