close

Pre Lab almost eight

 Pre Research laboratory 8 Dissertation

McKenzie Sluder

Chem 125

Pre Lab Test 8

Detminination of % formula of Pennies Using Redox and Double Displacement (Precipitation) Reactions Arguments: To determine the percent composition of pennies using oxidation lowering double displacement reactions and titration techniques 1 . Precisely what is the excess weight of a content 1982 dime?

2 . your five grams.

installment payments on your What is the percent water piping and zinc in a post 1982 penny?

The metal composition in the cent ninety-seven. 5 percent copper mineral and installment payments on your 5 percent zinc. 3. Just how many grams of birdwatcher and zinc are in a post 1982 penny?

installment payments on your 5 grms.

4. How many skin moles of copper mineral and zinc are in post 1982 pennies?

(2. 43 g Zn x 1 mol Zn) / 63. 38 g Zn = 0. 037 mol Zn

(0. 062 g Cu x 1 mol Cu) / 63. fifty four g Cu = zero. 00097 mol Cu

5. Write a balances reaction of zinc with HCL

Zn + 2HCl � ZnCl2 + H2

six. How many moles of HCL will be needed to behave completely with all the zinc within a post 1982 penny?

installment payments on your 43moleZn 5. (2molesHCl/1moleZn rate from reaction)=4. 6mole HC 7. Within a procedure developed to determine the percent zinc in post 1982 pennies, 40 mL associated with an HCL option was used to react (dissolve) all of the zinc in the penny. To ensure complete reaction, the perfect solution is contains twice as man skin moles of HCL that is in fact needed. What concentration of HCL should be used?

(0. 074 mol HCL / 0. 05 L ) =1. forty-eight M

8. In the situation described in problem six, what is the quantity (in moles) of excessive (unreacted) HCL in option?

(1. 312 g HCL by 2 mol HCL) / 35. 453 g HCL = zero. 074 mol HCL

on the lookout for. How many moles of NaOH will be needed to completely react with all of the excess HCL determined in problem 8?

HCL (aq) + NaOH (aq)� H20 (I) & NaCl (aq)

(0. 074 mol HCL x one particular mol NaOH) / 1mol HCL = 0. 074 mol NaOH

10. As described in problem 7, a procedure was created to determine the percent in content 1982 pennies. In that procedure 50 mL of an HCL was used to react (dissolve) all of the zinc in the cent. To ensure complete reaction, the perfect solution is contains twice as many skin moles of HCL that...

 Silvio Napoli at Schindler India - Harvard Businees Case Article

Silvio Napoli at Schindler India - Harvard Businees Case Article

COMM 374 - International Business Strategy Day: March four, 2007 To: Silvio Napoli, and Schindler Holding Limited. Via: Chia–Jung Chang 5549039 Lso are: Silvio Napoli…...

Read
 Segmentation, Target Market Selection and Positioning Practice in Automotive Industry Essay

Segmentation, Target Market Selection and Positioning Practice in Automotive Industry Essay

SEGMENTATION, TARGET MARKET ASSORTMENT AND PLACEMENT (STP) PRACTICE in AUTOMOTIVE INDUSTRY Marketing Administration CONTENTS BASIC INFORMATION2 INTRODUCTION TO THE INDUSTRY2 PROCESS OF SEGMENTATION6 …...

Read