## Search found 19 matches

Sat Dec 03, 2016 3:56 pm
Forum: *Titrations & Titration Calculations
Topic: 2014 Final Q7
Replies: 1
Views: 603

### 2014 Final Q7

Which of the following indicators could you use fir a titration of 0.20 M CH3COOH (aq) with 0.20 M NaOH (aq). Explain your selection and justify your answer with detailed calculations. The Ka for acetic acid is 1.8x10^-5 In the solution, the book states that the acid and base have identical concentr...
Tue Nov 29, 2016 11:55 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: 13.5 [ENDORSED]
Replies: 2
Views: 455

### 13.5[ENDORSED]

What is the concentration of hydronium ions in a solution that is .075 M HCN (aq) and .060 M NaCN (aq)

How do you come up with the reaction formula for this problem? Why does the product CN not include "Na"?
Tue Nov 29, 2016 11:41 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 12.59
Replies: 1
Views: 274

### 12.59

12.59 Calculate the pH, pOH and percentage profanation of solute in each of the following aqueous solutions: a) .057 M NH3 (aq) Why would you add a hydrogen to NH3 to make it NH4? Is NH3 a base, if so why? How can you determine if a compound is a base or an acid without knowing the products it creat...
Mon Nov 28, 2016 5:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: the unit "bar"
Replies: 1
Views: 344

### the unit "bar"

In the homework problems, some of the questions use the unit "bar"? What type of unit is this and is it the same as molar concentration?
Wed Nov 16, 2016 8:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: what is the concentration
Replies: 1
Views: 253

### what is the concentration

a .865 mol sample of PCl5 (g) is placed in a .5 L reaction vessel. What is the concentration of each substance when the reaction PCl5 (g) <--> PCl3 (g) + Cl2 (g) has reached equilibrium at 523K (Kc = 1.80) For this problem I tried to divide .865 moles of PCl5 by the .5 L vessel to get the molarity c...
Tue Nov 15, 2016 10:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: concentration problem
Replies: 1
Views: 266

### concentration problem

#7 What is the initial reaction quotient when 3.4 g NH4HS is initially placed in a 2.0 L vessel along with 1.47 mol of NH3 and 2.85 mol of H2S? NH4HS (s) <--> NH3 (g) + H2S (g), Kc = 1.6 x 10^-4 @ 24 degrees K Would I divide 1.47 mol of by 2 L to get the molarity of NH3 and then the same process for...
Tue Nov 15, 2016 10:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: calculating Kc [ENDORSED]
Replies: 3
Views: 405

### Re: calculating Kc[ENDORSED]

Thank you!
Tue Nov 15, 2016 8:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: calculating Kc [ENDORSED]
Replies: 3
Views: 405

### calculating Kc[ENDORSED]

A researcher fills a 1.00L reaction vessel with 2.80x10^-5 mol of BrCl gas and heats it to 500K. At equilibrium 8.12% of the BrCl gas remains. Calculate the equilibrium constant Kc assuming the following equation BrCl <--> Br2 + Cl2 Help! Also, Is this question related to the material covered for qu...
Mon Nov 14, 2016 4:44 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: 4.67
Replies: 2
Views: 722

### 4.67

How we would solve this problem?
Based on their valence shell electron configurations which of the following species would you expect to have the lowest ionization energy:
C2+, C2, C2- ?
Mon Nov 07, 2016 2:41 pm
Forum: Dipole Moments
Topic: polarity
Replies: 1
Views: 421

### polarity

If a structure has 5 chlorine atoms attached to a central phosphorus atom, why would it be polar?
Sun Oct 23, 2016 8:06 pm
Forum: Lewis Structures
Topic: 3.49 part c
Replies: 1
Views: 306

### 3.49 part c

Draw the Lewis structure and determine the formal charge on each atom in (c) CO why is there a triple bond between the two elements and not a double bond? The triple bond gives the carbon a 1+ formal charge and the oxygen a -1 formal charge but I thought the purpose of the formal charge was to get e...
Sun Oct 23, 2016 3:07 pm
Forum: Student Social/Study Group
Topic: solutions manual
Replies: 3
Views: 618

### Re: solutions manual

604765741 wrote:I can lend you my solutions manual! Did you still need it?

yes please why don't you email me at geoperris76@yahoo.com !!!
Sun Oct 23, 2016 2:55 pm
Forum: Student Social/Study Group
Topic: solutions manual
Replies: 3
Views: 618

### Re: solutions manual

yes please why don't you email me at geoperris76@yahoo.com !!!
Sun Oct 23, 2016 1:34 pm
Forum: Student Social/Study Group
Topic: solutions manual
Replies: 3
Views: 618

### solutions manual

If someone would please help me out by taking pictures of their solution manual chapter 3 only up to problem 45, i would greatly appreciate it. I bought mine online and the whole first section of the chapter is missing! Please help me, comment on this and I will give you my email
Fri Oct 21, 2016 8:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chapter 2 Question 2.43 [ENDORSED]
Replies: 2
Views: 450

### Re: Chapter 2 Question 2.43[ENDORSED]

Would this be the case for only the "coinage" metals, such as Cu, Ag, and Au? Or does this abnormality occur with any other elements?
Fri Oct 21, 2016 2:37 pm
Forum: Properties of Electrons
Topic: Electron Model
Replies: 1
Views: 274

### Electron Model

Hi, can anyone explain the electron model on page 19 of the course reader?
Wed Oct 12, 2016 9:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: diluted solution
Replies: 1
Views: 278

### diluted solution

A research assistant prepared 300 mL of a .900 M solution of potassium sulfate. However, the assistant accidentally read the instructions wrong and was meant to prepare a .400 M solution. What volume should the original solution be diluted to in order to prepare a .400 M solution? How many moles of ...
Tue Oct 04, 2016 6:55 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1.57 [ENDORSED]
Replies: 5
Views: 1105

### Re: 1.57[ENDORSED]

I am also lost on this question and when I used the two solutions given, the answers were not right. Is there any other clearer explanation to help solve this problem?
Thu Sep 29, 2016 9:26 pm
Forum: Student Social/Study Group
Topic: Off Campus/Apartments Study group
Replies: 5
Views: 826

### Re: Off Campus/Apartments Study group

I am interested as well. Any day is good for me depending on the time.

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