ws10302key - CH 302 Worksheet 10 Answer Key 1 NaH2PO4(conc...

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

View Full Document Right Arrow Icon
CH 302 Worksheet 10 Answer Key 1. NaH 2 PO4 (conc. = C NaH2PO4 ) is dissolved in water. Write the mass balance equation for this system. Answer: C NaH2PO4 = [H 3 PO 4 ] + [H 2 PO 4 - ] + [HPO 4 2- ] + [PO 4 3- ] 2. Write the charge balance equation for the solution in question 1. Answer: [H + ] = [OH - ] + [H 2 PO 4 - ] + 2[HPO 4 2- ] + 3[PO 4 3- ] 3. Write the charge balance equation for a solution containing all of the following ions: H + , OH - , Na + , Ba 2+ , PO 4 3- , Ag 3+ , SO 4 2- , and COOH - . Answer: [H + ] + [Na + ] + 2[Ba 2+ ] + 3[Ag 3+ ] = [OH - ] + [COOH - ] + 2[SO 4 2- ] + 3[PO 4 3- ] 4. NaH 2 PO 4 , LiHCO 3 , HCl, NaCl, and LiOH are all dissolved in water. How many equations are needed to completely describe this system? Answer: In solution, we have: H + , OH - , Na + , H 3 PO 4 , H 2 PO 4 - , HPO 4 2- , PO 4 3- , Li + , H 2 CO 3 , HCO 3 - , CO 3 2- , and Cl - . So we need 12 equations. 5. Write a charge balance equation for the system described in question 4. Answer: [H + ] + [Na + ] + [Li + ] = [OH - ] [Cl - ] + [H 2 PO 4 - ] + 2[HPO 4 2- ] + 3[PO 4 3- ] + [HCO 3 - ] + 2[CO 3 2- ] 6. Write the mass balance equation for H 2 CO 3 (conc. = C H2CO3 ) in water. Answer: C H2CO3 = [H 2 CO 3 ] + [HCO 3 - ] + [CO 3 2- ] 7. Find the pH of 10 -8 M HCl like you would have for the last two quizzes. Then find it using the exact expression, [H + ] 2 – [H + ]C HCl – K w = 0. Compare the two answers. Answer:
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 10/07/2011 for the course CHEMISTRY 51635 taught by Professor Laude during the Spring '10 term at University of Texas.

Page1 / 3

ws10302key - CH 302 Worksheet 10 Answer Key 1 NaH2PO4(conc...

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