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CSCA ChemistryChapter 1: Basic Chemical Concepts and CalculationsBeginner

Ideal Gas Law, Solution Concentration & pH

气体摩尔体积、溶液浓度与pH计算 · Node 1.2

Molar gas volume at STP (22.4 L/mol), ideal gas equation PV=nRT, molarity dilutions, and pH calculations.

Chapter Weight: 25% of official examination
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Core Mathematical Axiom

Formula Proof & Traps
PV=nRT,c1​V1​=c2​V2​,pH=−log[H+],Kw​=[H+][OH−]=1.0×10−14
CSCA Exam Trap Alert

Assuming molar gas volume is 22.4 L/mol at room temperature (25°C, where V_m is actually ~24.5 L/mol).

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