Search found 16 matches

Sat Dec 13, 2014 2:26 pm
Forum: Naming
Topic: Clarifying Naming ligands in Formula
Replies: 4
Views: 532

Re: Clarifying Naming ligands in Formula

Strangely, my course reader is missing that page with number 5 on it. Sorry...
Sat Dec 13, 2014 2:24 pm
Forum: Naming
Topic: Clarifying Naming ligands in Formula
Replies: 4
Views: 532

Re: Clarifying Naming ligands in Formula

I'm not sure what it means to list ligands by their electrical charges. However, I have never encountered any problems on exams (both real and practice) by listing them in alphabetical order.
Sat Dec 13, 2014 2:20 pm
Forum: *Titrations & Titration Calculations
Topic: strong base and strong acid vs weak base and strong acid
Replies: 3
Views: 480

Re: strong base and strong acid vs weak base and strong acid

Also, the HH equation provides a short alternative to the equilibrium table. For strong acid-strong base titrations, you don't need to set up an equilibrium table. Strong acid-strong base titration calculations and vice versa are quite straightforward.
Sat Dec 13, 2014 2:10 pm
Forum: Naming
Topic: Clarifying Naming ligands in Formula
Replies: 4
Views: 532

Re: Clarifying Naming ligands in Formula

I think you are confused about the difference between ligands, ions, complexes, and coordination compounds. Regarding the chemical formula of the coordination compound: 1. The complex consists of the ligands and the metal ion inside the brackets. In here, the ligands are listed based on the alphabet...
Sat Dec 13, 2014 1:22 pm
Forum: Lewis Acids & Bases
Topic: Concentration of hydronium ions
Replies: 2
Views: 450

Re: Concentration of hydronium ions

They will always give you the pKa, pKb, Ka, or Kb values. You just have to now how to convert between those four values.
Wed Dec 03, 2014 10:47 am
Forum: Naming
Topic: Elements before the brackets
Replies: 4
Views: 593

Re: Elements before the brackets

It depends. Are you trying to write out the chemical formula? If so, you need to include the cation or anion outside of the brackets. Remember: cations go before the complex (inside the brackets) and anions go after the complex. At the end, the outside ion(s) and the complex need to balance out so t...
Wed Dec 03, 2014 10:39 am
Forum: Naming
Topic: Knowing whether the compound has net neutral charge or not
Replies: 7
Views: 845

Re: Knowing whether the compound has net neutral charge or n

A coordination compound is always electrically neutral. It includes the complex (metal and ligands inside the brackets) and any outside ions. Therefore, it is not the coordination compound that has the -2 charge, it is the complex. Complexes (only the stuff inside the brackets) can be neutral, anion...
Tue Dec 02, 2014 4:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 2012 Quiz 3 Number 4
Replies: 4
Views: 593

Re: 2012 Quiz 3 Number 4

You can expect N to bond to the metal center because of its lone pair. An important characteristic of C is that it forms four bonds. On rare occasions would it deviate from that general pattern. In this problem, you do not need to know that Pt has a +2 charge in order to figure out how many (en) lig...
Tue Dec 02, 2014 3:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining number of ligands
Replies: 7
Views: 1889

Re: Determining number of ligands

I reposted my answer from another question regarding the same problem. Information about the geometry of the complex allows us to determine the number of bonds that the central metal will form. In this case, platinum ion is the center of a square planar complex. A square planar complex has four corn...
Tue Dec 02, 2014 3:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 2
Views: 403

Re: Coordination Number

Are you sure it's not (en)3 rather than (en)2? Because the complex [Co(en)3]3+ is octahedral.
Fri Nov 28, 2014 11:22 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 2012 Quiz 3 Number 4
Replies: 4
Views: 593

Re: 2012 Quiz 3 Number 4

Information about the geometry of the complex allows us to determine the number of bonds that the central metal will form. In this case, platinum ion is the center of a square planar complex. A square planar complex has four corners and therefore four bonds to the ligand(s). This particular ligand i...
Fri Nov 28, 2014 10:59 pm
Forum: Naming
Topic: Remembering polydentates
Replies: 4
Views: 587

Re: Remembering polydentates

The number of lone pairs (with each pair on separate atoms) is indeed helpful in determining the number of binding sites one ligand can have. For instance, in the chemical formula for diethylenetriamine, N H2CH2CH2 N HCH2CH2 N H2, there are three nitrogens. The three nitrogens each have a lone pair ...
Fri Nov 28, 2014 10:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Module Question
Replies: 2
Views: 385

Re: Module Question

The answer is most likely P = nRT/V because: 1) The question is asking for the pressure value, so P must be isolated on the lefthand side. 2) n/V indicates the moles per liter which is the concentration of the gas. Its value would be provided. 3) R is the gas constant, which is always given. 4) T is...
Fri Nov 28, 2014 10:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Conceptual Question about Equilibrium Constants
Replies: 1
Views: 379

Re: Conceptual Question about Equilibrium Constants

The answer is most likely No, because most solvents are liquid or solid. Liquids and solids are not included in the equilibrium constant expression, because they are essentially incompressible, without varying concentration. Although solvents can be gaseous, I doubt that No is the wrong answer, beca...
Sun Nov 23, 2014 6:36 pm
Forum: Naming
Replies: 2
Views: 585