Workshop 4 answers

Workshop 4 answers - 4. Write the net ionic equation for...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
NAMES: ____________________________________________________________ WORKSHOP 4 (20 points) Solution Stoichiometry Spring 2011 1. (3 points )What would the concentration be if you used 27g of calcium chloride to make 500. mL of solution? What is the concentration of each ion? 27g/ 111 g/mol= 0.243 mol 0.243mol/0.5L= 0.486 M [Ca 2+ ]=0.486 M [Cl - ] =0.973 M 2. (a) What is an electrolyte? Give an example of strong, weak and non-electrolyte (each). (b) What is a substance that takes in or dissolves other substances? solvent 3. How much acetone (CH 3 COCH 3 ) (in moles) would be needed to obtain 7.85 L of acetone? The density of acetone is 0.851 g/mL. MM (acetone) = 58g/mol m= d*V= 0.851g/ml* 7850ml=6680.35 g #moles= 6680.35g/58g/mol= 115 mol
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 4. Write the net ionic equation for this reaction occurring in water: Sodium phosphate and calcium chloride are mixed to form 2 PO 3 4 + 3Ca 2+ Ca 3 (PO 4 ) 2 5. What acid and what base would you choose to prepare the salt potassium perchlorate? HClO 4 and KOH 6. (4 pts) Consider the redox reaction (unbalanced) MnO 4 + 5Ni 2+ + H + Mn 2+ + 8Ni 3+ + H 2 O (a) Identify half-reactions (oxidation and reduction). Mn 7+ Mn 2+ +5 e- red /1 Ni 2+ +1 e- Ni 3+ oxid /* 5 (b) How much Ni 2+ (in grams) is used if 5.00 millimoles of Mn 2+ are produced? # mol of Ni 2+ = 5*5mmol= 25mmol 25mmols * 58.6g/mol= 1450mg= 1.45g...
View Full Document

This note was uploaded on 04/21/2011 for the course CHEM 102 taught by Professor Peterpastos during the Spring '08 term at CUNY Hunter.

Page1 / 2

Workshop 4 answers - 4. Write the net ionic equation for...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online