Homework 3-solutions

Homework 3-solutions - jaw2435 Homework 3 Walker (53985)...

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

View Full Document Right Arrow Icon
jaw2435 – Homework 3 – Walker – (53985) 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 1.0 points Which oF the Following does not describe an acid? 1. Acids donate hydrogen ions in water. 2. Acids react with bases. 3. Acids taste sour. 4. Acids donate hydroxide ions in water. correct Explanation: Acids have a sour taste and they give o± hydrogen ions in water which are used to neu- tralize bases. 002 1.0 points Ca(NO 3 ) 2 could be best classifed as 1. a salt. correct 2. a base. 3. an acid. Explanation: Ca(NO 3 ) 2 is salt Formed From reaction be- tween the strong acid HNO 3 and the strong base Ca(OH) 2 . 003 1.0 points The equation For the neutralization oF NaOH with HCl is 1. NaOH + HCl NaHCl + OH 2. NaOH + HCl HClO + NaH 3. NaOH + HCl H 2 OCl + Na 4. NaOH + HCl NaCl + H 2 O correct Explanation: The products oF this acid-base reaction are the salt (NaCl) and water. 004 1.0 points How many moles oF NaOH are needed to neu- tralize three moles oF HCl? 1. 0.5 2. eight 3. one 4. 1.5 5. two 6. Four 7. three correct 8. six Explanation: ²or acid base neutralization we need one mole oF H + For every mole oF OH . ThereFore the balanced equation is HCl + NaOH NaCl + H 2 O ? mol NaOH = 3 mol HCl × 1 mol NaOH 1 mol HCl = 3 mol NaOH 005 1.0 points Vinegar (CH 3 COOH) is considered a weak acid because it 1. releases a small percentage oF OH in water. 2. releases a small percentage oF hydrogen ions in water. correct 3. contains an OH Function group. 4. contains Four hydrogen atoms. Explanation: The reaction is CH 3 COOH + H 2 O CH 3 COO + H 3 O + K a = 1 . 8 × 10 5
Background image of page 1

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

View Full DocumentRight Arrow Icon
jaw2435 – Homework 3 – Walker – (53985) 2 006 1.0 points Which solution has the lowest pH? 1. 2 . 0 × 10 1 moles of NH 3 in 0.25 L of solution 2. 5 . 0 × 10 3 moles of HCl in 500 mL solu- tion 3. 0.12 grams of Ca(OH) 2 in 0.2 L of solu- tion 4. 5 . 0 × 10 3 moles H 2 SO 4 in 0.5 L of solution correct Explanation: The answer is deFnitely not NH 3 nor Ca(OH) 2 because they are both bases, which have relatively high pH’s compared to acids. H
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.

This note was uploaded on 05/01/2008 for the course CH 305 taught by Professor Sutcliffe during the Spring '08 term at University of Texas.

Page1 / 5

Homework 3-solutions - jaw2435 Homework 3 Walker (53985)...

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