ACT Science Practice Question #1512 (Medium (31)) | Test Citadel
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ACT Science Difficulty: Medium (31)

Digital ACT Science Practice Question #1512

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A chemist compared 50 mL of unbuffered water to 50 mL of 0.1 M phosphate buffer (initial pH 7.00): - Adding 1.0 mL of 1.0 M HCl to water: pH drops to 1.70 - Adding 1.0 mL of 1.0 M HCl to buffer: pH drops to 6.82 The buffer resists dramatic pH changes because:
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Buffer contains conjugate base that absorbs added H+.

Masterclass Solution & Distractor Trap Analysis

Buffers contain a weak acid/base conjugate pair that reacts with added H+ or OH- to stabilize pH....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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