Post-lab 5 Strong Acid Base-solutions

Post-lab 5 Strong Acid Base-solutions - choudhury (fac489)...

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Unformatted text preview: choudhury (fac489) – Post-lab 5 Strong Acid Base – lyon – (51155) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The pH of a solution of hydrochloric acid is 2.80. What is the molarity of the acid? 1. 4 . 2 × 10 − 2 M 2. 6 . 3 × 10 − 2 M 3. 4 . 2 × 10 − 3 M 4. 1 . 6 × 10 − 3 M correct 5. 6 . 3 × 10 − 3 M Explanation: pH = 2.80 [H + ] = 10 − pH = 10 − 2 . 80 = 1 . 6 × 10 − 3 M Since HCl is a strong acid, it is completely dissociated, so its concentration here is also 1.6 × 10 − 3 M. 002 10.0 points The question should read, which of the fol- lowing are strong acids and strong bases in aqueous solution? Which of the following are strong acids in aqueous solution? 1. H 2 SO 4 , HClO 4 , H 3 PO 4 and KOH 2. H 2 SO 4 , H 3 PO 4 , KOH and Ba(OH) 2 3. H 2 SO 4 , KOH, Mg(OH) 2 and Ba(OH) 2 4. H 2 SO 4 , HClO 4 , KOH and Mg(OH) 2 5. H 2 SO 4 , HClO 4 , KOH and Ba(OH) 2 cor- rect Explanation: Strong acids and strong bases dissociate completely in water. 003 10.0 points To determine the volume dispensed from the burette, two readings must be taken. Briefly describe how the volume dispensed is deter- mined. How many digits should each volume reading have after the decimal place? 1. Record the initial volume reading from the burette before dispensing any volume, then carry out the titration and record the final volume. To determine the volume dis- pensed, subtract the initial volume from the final volume. All volume readings done on a burette should be recorded to 2 decimal places. correct 2. Fill the burette to the top before each titration, and then read the final volume when the endpoint is reached. The volume dispensed is the final volume. All volumes should be recorded to 2 decimal places. 3. As long as you have two different volume readings from the burette and they are both recorded to 2 decimal places, it doesn’t matter how you got them because any errors in the measurement will cancel out. 4. Record the initial volume reading from the burette, then carry out the titration and record the final volume. To get the volume dispensed, subtract the final volume from the initial volume. All volume readings done on a burette should be recorded to 1 decimal place. 5. Record the initial volume reading from the burette, then carry out the titration and record the final volume. To get the volume dispensed, subtract the final volume from the initial volume. All volume readings done on a burette should be recorded to 2 decimal places, but trailing zeroes can be dropped because they are not significant. 6. Record the initial volume reading from the burette before dispensing any volume, then carry out the titration and record the fi- nal volume. To get the volume dispensed, add choudhury (fac489) – Post-lab 5 Strong Acid Base – lyon – (51155) 2 the two volumes together. All volume read- ings done on a burette should be recorded to...
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This note was uploaded on 12/13/2011 for the course CH 204 taught by Professor Leytner during the Fall '08 term at University of Texas.

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Post-lab 5 Strong Acid Base-solutions - choudhury (fac489)...

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