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Practice Sheet 14 key

# Practice Sheet 14 key - 1 5 O H C g L 1 mL 1000 ml 100 1...

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Practice Sheet 14 BLC & DLC answers 14B.1 a) 2H 2 O( ) = OH (aq) + H 3 O + (aq) acid = H 2 O conjugate base = OH base = H 2 O conjugate acid = H 3 O + Water can act as an acid and as a base because it is amphoteric. b) NH 3 (aq) + H 2 O( ) = NH 4 + (aq) + OH (aq) acid = H 2 O conjugate base = OH base = NH 3 conjugate acid = NH 4 + c) HPO 4 2– (aq) + H 2 O( ) = OH (aq) + H 2 PO 4 (aq) acid = H 2 O conjugate base = OH base = HPO 4 2– conjugate acid = H 2 PO 4 - 14B.2 Acid: HCO 3 - (aq) + H 2 O( ) = H 3 O + (aq) + CO 3 2 - (aq) Base: HCO 3 - (aq) + H 2 O( ) = OH - (aq) + H 2 CO 3 (aq) 14D.1 a) Find the molar mass of NaCl and use it to calculate the mass of 1.3 mol. Put this mass in a volumetric flask and add water to ~950 mL. Once solid is dissolved top off volume to 1.0 L precisely using a squirt bottle. b) + L Na mol 0.80 + Na mol 2 SO Na mol 1 4 2 1 mL 500 mL 1000 L 1 4 2 4 2 SO Na mol 1 SO Na g 142 = 28.4 g 14D.2 Solve this problem just like all the other stoichiometry questions we have been doing lately. × 6 12 6 6 12 6 6 12 6 O H C g 180.16 O H C

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Unformatted text preview: 1 5 O H C g L 1 mL 1000 ml 100 1 → 0.278 M 14D.3 + 3 2 3 2 CO K mol 1 K mol 2 L CO K mol 15 . = .030 M K + 14D.4 a) mL 1000 L 1 1 sol SO Na mL 15 4 2 4 2 4 2 4 2 4 2 SO Na mol 1 SO Na g 142.04 SO Na L 1 SO Na mol .50 = 1.1 g b) mol .038 L 1 mL 1000 mol .50 L = 76 mL 14D.5 See back of book 14D.6 a) Hypochlorous acid, weak b) Nitric acid, strong c) Sulfurous acid, weak d) Sodium hydroxide, strong e) Hydrobromic acid, strong f) Phosphoric acid, weak g) Iodous acid h) Perchloric acid i) Hydrochloric acid j) Acetic acid k) Hydrofluoric acid l) Bromic acid...
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