Lecture+10

# Lecture+10 - Summary of terms used in problem solving Moles...

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Summary of terms used in problem solving Moles Formula weight Equivalents Weight of 6.022 x10 23 units Molecular weight Formula weight Equivalent weight MW FW EW Units g/mol, mg/mmol g/mol, mg/mmol g/eq, mg/meq Amount of material moles moles equivalents abbreviation mol mol eq milliquantity millimoles millimoles milliequivalents abbreviation mmol mmol meq concentration Molar (M) Formal (F) Normal (N) units Mol/L Mol/L Eq/L

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con con dil dil M VM V ×= × 1 mol of a diprotic acid has 2 equivalents
Useful equations

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Problems Chapter 7 7.1 to 7.7 7.10 to 7.12 7.19, 7.22, 7.27 and 7.28 Chapter 9 9.2 to 9.8 9.19 to 9.23 9.26 to 9.35

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Ammonia reacts with hypobromite, OBr , by the reaction 2NH 3 + 3OBr −→ N 2 + 3Br + 3H 2 O. What is the molarity of a hypobromite solution if 1.00 mL of the OBr solution reacts with 1.69 mg of NH 3 ? 1.69 mg of NH 3 = 0.0992 mmol of NH 3 N= 14.0067 H= 1.008 1.69/17.03=0.0992 2 of NH 3 react with 3 of OBr ; 3/2(0.0992)= 0.149 0.149 M 7.9
In precipitation titrations of halides by Ag+, the ion pair AgX(

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Lecture+10 - Summary of terms used in problem solving Moles...

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