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HW12 - Chemistry 111 Homework#12 Due(Wednesday 1 When any...

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Chemistry 111 Homework #12 Due: December 07, 2005 (Wednesday) 1. When any acid dissolves in water, what very common ion (that distinguishes all acids in water) does it form? Type your one word answer in Blackboard (spell out the name of the ion). 2. When an acid (like HA) dissolves in water, it forms not only the ion you talked about in question 1 , but also A -1 . This new ion formed is what, an acid or a base? Type your one word answer in Blackboard. 3. There is a relationship between these two species… HA and A -1 . We call them __________ acid base pairs. Type the word in Blackboard. 4. It has been said before, “The stronger the acid, the ___________ its conjugate base.” Type the word in Blackboard. 5. According to that statement in the previous question, then we can say that the conjugate base of a weak acid must be a strong base. True or false? 6. Let’s say that you are told that HA is a stronger acid than HB. Then we can say with certainty that B - is a ____________ base than A - . Type the word in Blackboard. 7. Ammonia (NH 3 ) is an amphoteric substance. True or False? 8. Which of these two compounds do you think is a stronger acid in water… HF or H 2 S? 9. Which base do you think is stronger, NH 3 (ammonia) or CH 4 (methane)? Write your answer in blackboard. Explain your answer for your own benefit. 10. What is the formula of the conjugate acid for the ion CH 3 CH 2 O -1 ? Write the formula in blackboard. If your answer were CH 3 CH 3 , you would type CH3CH3. 11. If a solution has a [H 3 O + ] = 2.34 × 10 -5 M, the pH of that solution would be _______. Type a numerical answer in Blackboard that has THREE decimal places. Why three? Because significant figures for logarithms are AFTER the decimal place. 12. The pH of pure distilled water goes down when you dissolve an acid in it. True or false?
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Chemistry 111 2 Homework #12 / Fall 2005 13. The concentration of hydroxide ions __________ when you dissolve an acid in pure distilled water. The answer should be either increases , decreases , or remains the same . Type your answer in Blackboard. 14. What is the pH of a solution that has a [OH - ] = 3.45 × 10 -6 M? Your answer should be typed in Blackboard to three decimal places. 15. Which is the weakest base from the following? a) CH 3 -O-CH 2 CH 3 b) CH 3 CH 2 -S-CH 3 c) CH 3 CH 2 -NH 2 d) CH 3 CH 2 PH 2 e) They are equally strong. 16. Which is the strongest acid from the following choices?
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