QUESTIONS 1. A0.821 gram sample of pure NH,F was treated with 25.0 mL of 1.00 M...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
QUESTIONS 1. A0.821 gram sample of pure NH,F was treated with 25.0 mL of 1.00 M NAOH and heated to drive off the NH,. How many mols of NaOH are needed to react with the NH,F? Molar Mass of NH4F = 37.037 grams a. 0.82) %3D 0.02216 ニ molar wass 37.037 0:0 222 mols| b. Нow many milliliters of 0.500 M HCI are needed for thc back titration? l,00mol 25.0 mL > 0.025 mol 1000 m/L し 0.00281 mol 0.500 mol /L 0.025 - 0.0222 = 0,00562L 0.00562L x 1000 mL/m 2. How is the calculated molarity of the NaOH affected (higher, lower, or unaffected) if the KHP used for standardization is contaminated with dirt (i.e., is not 100% pure)? Explain. If the KHP is contaminated, the actual mass of kHP useol Will be less then the meacured oot mass , So ty moles of 5.62mL %3D KHP will be higher resulting in a NAOH Moles.'Se the molaiity of NaOH will be higher. higher nomber of 3. Assume that 0.160 g of an unknown ammonium salt, NH X, is treated with 23.00 mL of 0.200 M NaOH, and 30.00 mỉ of 0.0500 M H,C,O, are necded for the back titration. Calculate the molar mass of the ammonium salt. 23 x 0.2 = 4.6= Torial Aa OH Token %3D 30 ml x 0.05M 2 = 3.0 4.6 -3=1,6 NG OH reacteal with ammouium salF 0.160g/larmass = l,l6 x 103M) Molar Mass =| 100 gmal 105 1.6 mo-3 QUESTIONS 1. A0.821 gram sample of pure NH,F was treated with 25.0 mL of 1.00 M NAOH and heated to drive off the NH,. How many mols of NaOH are needed to react with the NH,F? Molar Mass of NH4F = 37.037 grams a. 0.82) %3D 0.02216 ニ molar wass 37.037 0:0 222 mols| b. Нow many milliliters of 0.500 M HCI are needed for thc back titration? l,00mol 25.0 mL > 0.025 mol 1000 m/L し 0.00281 mol 0.500 mol /L 0.025 - 0.0222 = 0,00562L 0.00562L x 1000 mL/m 2. How is the calculated molarity of the NaOH affected (higher, lower, or unaffected) if the KHP used for standardization is contaminated with dirt (i.e., is not 100% pure)? Explain. If the KHP is contaminated, the actual mass of kHP useol Will be less then the meacured oot mass , So ty moles of 5.62mL %3D KHP will be higher resulting in a NAOH Moles.'Se the molaiity of NaOH will be higher. higher nomber of 3. Assume that 0.160 g of an unknown ammonium salt, NH X, is treated with 23.00 mL of 0.200 M NaOH, and 30.00 mỉ of 0.0500 M H,C,O, are necded for the back titration. Calculate the molar mass of the ammonium salt. 23 x 0.2 = 4.6= Torial Aa OH Token %3D 30 ml x 0.05M 2 = 3.0 4.6 -3=1,6 NG OH reacteal with ammouium salF 0.160g/larmass = l,l6 x 103M) Molar Mass =| 100 gmal 105 1.6 mo-3
Expert Answer:
Related Book For
Chemistry The Central Science
ISBN: 978-0321696724
12th edition
Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward
Posted Date:
Students also viewed these accounting questions
-
How many milliliters of 0.0850 M NaOH are required to titrate each of the following solutions to the equivalence point: (a) 40.0 mL of 0.0900 M HNO3, (b) 35.0 mL of 0.0850 M CH3COOH, (c) 50.0 mL of a...
-
How many milliliters of 0.202 M NaOH should be added to 25.0 mL of 0.0233 M salicylic acid (2-hydroxybenzoic acid) to adjust the pH to 3.50?
-
How many milliliters of aqueous 0.1 M NaOH are required to form the disodium salt from 100 mg of succinic acid?
-
Give Jacobson et al.s definition of a component.
-
In the sequential- move game described in part b of the previous question, Levi Strauss engages in pre- play communication ( cheap talk). Levi Strauss tells Wrangler that it will match Wranglers...
-
When is government censorship considered constitutional in the United States? What legal restraints can be used in the U.S. to silence political dissent? What forms of sedition have been historically...
-
Identify the general and specific laws and regulations addressed in the Single Audit Act Amendment and OMB Circular A-128, "Audits of States, Local Governments, and Non-profit Organizations."
-
Calculate the net present value (NPV) for the following 20-year projects. Comment on the acceptability of each. Assume that the firm has an opportunity cost of 14%. a. Initial investment is $10,000;...
-
What three leadership theories would best support organizational change in Starbucks' Mission and Values? How do these three theories compare?
-
Jamie Lee and Ross, now 57 and still very active, have plenty of time on their hands now that the triplets are away at college. They both realized that time has just flown by; over twenty-four years...
-
Use strategic planning tools to investigate the career field that interests you. Outline the industry and government trends as they relate to strategic planning. Conduct a SWOT analysis of your...
-
What sort of assumptions underlie the policy that cuts in income taxes would increase the supply of labour hours offered in an economy?
-
Firms experience a rise in stocks. Explain why this might have occurred and what you expect firms response to this event might be and how this might affect output.
-
What are the potential costs and benefits of policies designed to improve the flexibility of labour markets?
-
What sort of trade-offs do governments face if a decision was being considered to reduce the level of welfare benefits as part of a market-orientated supply-side policy?
-
Can the doom loop ever be broken?
-
A pharmaceutical company is studying the possibility of satisfying its electrical and thermal requirements using cogeneration. There are several possible configurations to carry out cogeneration,...
-
If a test has high reliability. O the test measures what the authors of the test claim it measures O people who take the same test twice get approximately the same scores both times O scores on the...
-
What exponential notation do the following abbreviations represent: (a) d (b) c (c) f (d) (e) M (f) k (g) n (h) m (i) p?
-
One of the steps in the commercial process for converting ammonia to nitric acid is the conversion of NH3 to NO: 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g) In a certain experiment, 2.00 g of NH3 reacts...
-
The A atoms are red, and the B atoms are blue. Is the reaction exothermic or endothermic?
-
How closely related do you believe language and thought to be? During the production of Chapter 3 in this book, the authors and editors debated whether we should use the word "autistics" or the...
-
When did human language originate?
-
Describe American styles of nonverbal communication. Are there different styles of nonverbal communication in different areas of the United States?
Study smarter with the SolutionInn App