H07- Acids-Bases 1-solutions

H07- Acids-Bases 1-solutions - patteson (dmp786) H07:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
patteson (dmp786) – H07: Acids-Bases 1 – McCord – (52405) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points What is the hydroxide concentration [OH ] in an aqueous solution in which the hydronium ion concentration [H 3 O + ] is 1 × 10 5 M? 1. 1 × 10 5 M 2. 1 × 10 14 M 3. 1 × 10 7 M 4. 1 × 10 9 M correct Explanation: [H 3 O + ] = 1 × 10 5 M K w = [H 3 O + ][OH ] = 1 . 0 × 10 14 [OH ] = K w [H 3 O + ] = 1 . 0 × 10 14 1 × 10 5 = 1 × 10 9 M 002 10.0 points Which oF the Following is true in pure water at any temperature? 1. pH = 7.0 2. [H 3 O + ] = [OH ] correct 3. [H 3 O + ][OH ] = 1.0 × 10 14 4. pH = 7.0 or greater than 7.0 5. K w decreases with increasing tempera- ture. Explanation: K w is shown to INCREASE with increas- ing temperature. pH = 7 is only true when water is at 24 C. [H 3 O + ][OH ] = K w , which increases with temperature. At high temperatures pH can be less than 7. Thus [H 3 O + ] = [OH ] is the only case that is true. 003 10.0 points What is [H 3 O + ] when [OH ] = 3 . 3 × 10 9 M? 1. 3 . 3 × 10 5 M 2. 6 . 6 × 10 5 M 3. 1 . 0 × 10 7 M 4. 3 . 0 × 10 6 M correct 5. 3 . 3 × 10 9 M Explanation: [OH ] = 3 . 3 × 10 9 M K w = [H 3 O + ][OH ] = 1 × 10 14 [H 3 O + ] = K w [OH ] = 1 . 0 × 10 14 3 . 3 × 10 9 = 3 . 0 × 10 6 M 004 10.0 points What is [OH ] when [H 3 O + ] = 8 . 2 × 10 5 M? 1. 1 . 2 × 10 10 M correct 2. 8 . 2 × 10 5 M 3. 6 . 3 × 10 9 M 4. 1 . 2 × 10 4 M 5. 1 . 0 × 10 7 M Explanation: [H 3 O + ] = 8 . 2 × 10 5 M K w = [OH ][H 3 O + ] = 1 . 0 × 10 14 [OH ] = K w [H 3 O + ] = 1 . 0 × 10 14 8 . 2 × 10 5 = 1 . 2 × 10 10 M 005 10.0 points What is [OH ] in a 0.0050 M HCl solution? 1. 6 . 6 × 10 5 M
Background image of page 1

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

View Full DocumentRight Arrow Icon
patteson (dmp786) – H07: Acids-Bases 1 – McCord – (52405) 2 2. 1 . 0 × 10 7 M 3. 5 . 0 × 10 3 M 4. 1 . 0 M 5. 2 . 0 × 10 12 M correct Explanation: [OH ] = 0 . 0050 M Since HCl is a strong acid, it completely dissociates and H + is 0 . 0050 M. HCl H + + Cl K w = [H + ][OH ] = 1 × 10 14 [OH ] = K w [H + ] = 1 × 10 14 0 . 0050 = 2 × 10 12 M 006 10.0 points What is the conjugate acid of NO 3 ? 1. NH 3 2. NO 2 3. HNO 3 correct 4. NO 3 2 5. H + 6. OH Explanation: Since the question asks for the conjugate acid, we can assume NO 3 is acting as a base. This means that it is a proton acceptor. To
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

H07- Acids-Bases 1-solutions - patteson (dmp786) H07:...

This preview shows document pages 1 - 3. Sign up to view the full document.

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