Acids & Bases
What pH is barf?
2
What’s the unit for molarity?
mol/L or M
What’s pH of pure water at 25°C?
7
Molar mass of H₂O?
18 g/mol
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Mark
Strong base example?
NaOH
0.5 mol NaCl in 2 L = ?
Work: 0.5 ÷ 2 = 0.25 M
HCl + NaOH →?
NaCl + H₂O
CaCO₃ molar mass?
100 g/mol
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Mateo Chiniquy
pH < 7 means?
Acidic
25 g NaCl (MM 58.5) in 0.5 L = ?
Work: 25 ÷ 58.5 ≈ 0.427 mol → 0.427 ÷ 0.5 = 0.854 M
pH of 0.001 M HNO₃?
Work: = 0.001 → pH = 3
(NH₄)₂SO₄?
2×14 + 8×1 + 32 + 64 = 132 g/mol
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Bill
Bases feel ___?
Slippery/Soapy
How many moles in 0.5 L of 2 M solution?
Work: moles = M × L = 2 × 0.5 = 1 mole
What is pH if [H⁺] = 0.001 M?
Work: pH = -log(0.001) = 3
Molar mass of CO₂?
Work: 12 + 16 + 16 = 44 g/mol
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Kai Brotman
Name a strong acid.
Answer: HCl, HNO₃, H₂SO₄
10 g NaCl (MM 58.5) in 0.2 L = ?
Work: moles = 10 ÷ 58.5 ≈ 0.171 mol → M = 0.171 ÷ 0.2 = 0.855 M or ≈ 0.86 M
20 mL of 0.1 M HCl needs how much 0.1 M NaOH to neutralize?
moles HCl = 0.1 × 0.02 = 0.002 mol → same moles NaOH needed → V = 0.002 ÷ 0.1 = 0.02 L = 20 mL
Molar mass of CaCO₃?
Work: 40 + 12 + 48 = 100 g/mol
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Kai Brotman