Exam 1B oct09 KEYpost

Exam 1B oct09 KEYpost - Chemistry 1 Exam 1 B October 2,...

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

View Full Document Right Arrow Icon
Exam 1 B October 2, 2009 Name _________________________ Student ID # ____________ Section _____ It is critically important that you show clear and logical responses. Be sure to use proper chemical equations, units, and show calculations quantitatively. 1. (18 pts) Assign whether the species in water would be an acid, base, or of neutral pH; a strong, weak, or non-electrolyte; and write the oxidation state of the specified element(s) in each compound. (a) SO 3 acid strong electrolyte S +6 base weak electrolyte neutral nonelectrolyte (b) Na 2 O acid strong electrolyte Na +1 base weak electrolyte neutral nonelectrolyte (c) Fe(IO 3 ) 2 acid strong electrolyte Fe +2 I +5 base weak electrolyte neutral nonelectrolyte (d) HCO 2 H acid strong electrolyte C +2 O -2 base weak electrolyte neutral nonelectrolyte (e) HSO 3 ˉ acid strong electrolyte S +4 O -2 base weak electrolyte neutral nonelectrolyte 2. (13 pts) Household ammonia is an aqueous ammonium hydroxide solution containing 4.00% ammonium hydroxide by mass. (a) What is the molar concentration of household ammonia? MM NH4OH = 14.0067 g/mol + 5(1.00797 g/mol) + 15.9994 g/mol = 35.04595 g/mol 4.00 g NH 4 OH × 1.00 g ammonia × 1000 mL × 1 mol NH 4 OH 100 g ammonia 1 mL ammonia 1 L 35.04595 g NH 4 OH = 1.14 M (b) A diluted solution of ammonia is prepared for disinfection of floors and countertops by adding 175 mL of ammonia into 3.0 L of water. What is the molar concentration of the solution used for disinfection? (175 mL)(1.14 M) = (3.0 L + 175 mL)(C
Background image of page 1

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

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

This note was uploaded on 01/24/2011 for the course CHEM 1 taught by Professor Collier during the Spring '08 term at Missouri S&T.

Page1 / 7

Exam 1B oct09 KEYpost - Chemistry 1 Exam 1 B October 2,...

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