Search found 12 matches

by Soraya Sadeghi 1B
Fri Dec 12, 2014 10:58 pm
Forum: *Titrations & Titration Calculations
Topic: calculating pH in weak acid-strong base titration
Replies: 1
Views: 319

calculating pH in weak acid-strong base titration

In the book, example 12.6 on page 491, they calculate the pH of the resulting solution after base is added to a solution of weak acid, before reaching the stoichiometric point. They calculate this pH through using the Henderson-Hasselbalch equation. I was wondering, why does the book use that equati...
by Soraya Sadeghi 1B
Fri Dec 12, 2014 1:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: sig figs for pH after taking the -log
Replies: 1
Views: 460

sig figs for pH after taking the -log

I was wondering how you would know how many sig figs the pH of a solution would have after you take the -log. For example, if the question gives you a measured concentration of .423 M of a molecule (3 sig figs), then when you are assessing the -log of a value, you would include three sig figs when t...
by Soraya Sadeghi 1B
Wed Dec 10, 2014 10:59 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Why is HI more acidic than HF?
Replies: 1
Views: 7750

Why is HI more acidic than HF?

I though that the atom with the higher electronegativity would withdraw more electrons toward it and make the molecule polar and unstable, thus releasing a proton more readily, making it a stronger acid. Following this logic, since Fluorine is more electronegative than Iodine, I thought that HF woul...
by Soraya Sadeghi 1B
Sat Nov 29, 2014 9:19 pm
Forum: Naming
Topic: naming complexes vs. coordination compounds
Replies: 3
Views: 586

Re: naming complexes vs. coordination compounds

oh ok thank you so much! but what about when writing the chemical formula of a coordination compound; does the order of writing ligands matter?
by Soraya Sadeghi 1B
Sat Nov 29, 2014 5:34 pm
Forum: Naming
Topic: naming complexes vs. coordination compounds
Replies: 3
Views: 586

naming complexes vs. coordination compounds

so essentially when writing the name of a complex ion, the ligands should be written in alphabetical order (excluding the Greek prefixes); but when writing the name of a coordination compound, the anion ligands should be written before the neutral ligands even if, for example, the anion starts with ...
by Soraya Sadeghi 1B
Sat Nov 29, 2014 3:54 pm
Forum: Naming
Topic: ch 16 #29 part b
Replies: 1
Views: 306

ch 16 #29 part b

For part b, the question asks to write the formula for pentaaminesulfatocoobalt(III) chloride. Why is the answer
[Co(NH3)5 (SO4)] Cl instead of [Co(NH3)5 (SO4)] Cl3? I thought that there should be three Cl to cancel the charge of +3 on the Cobalt.
by Soraya Sadeghi 1B
Sat Nov 29, 2014 11:30 am
Forum: Naming
Topic: Ligand Names
Replies: 1
Views: 470

Ligand Names

When writing the ligand names in coordination compounds, should we use the original older names or the new IUPAC name convention? For example, for F- should we write fluoro or fluorido?

Thanks so much!
by Soraya Sadeghi 1B
Tue Nov 11, 2014 8:55 pm
Forum: Hybridization
Topic: general question about hybridization
Replies: 2
Views: 456

general question about hybridization

When writing the hybridization of a molecule with 5 regions of electron density, which form should we write the hybridization in: dsp^3 or sp^3d? Do they mean the same thing?
by Soraya Sadeghi 1B
Tue Oct 21, 2014 3:25 am
Forum: DeBroglie Equation
Topic: Quiz 1 Prep Fall 2013 #5
Replies: 1
Views: 429

Re: Quiz 1 Prep Fall 2013 #5

Actually I realized my mistake! I made a small error during the conversion. The correct conversion of 125 km/hr equals 34.72m/s
by Soraya Sadeghi 1B
Tue Oct 21, 2014 12:05 am
Forum: DeBroglie Equation
Topic: Quiz 1 Prep Fall 2013 #5
Replies: 1
Views: 429

Quiz 1 Prep Fall 2013 #5

For this question, I converted the speed of the motorcycle to 2.08*10^3 m/s and then used DeBroglie equation. I did h/((275)(2.08*10^3)) but I can't seem the get the right answer. Could someone tell me what I'm doing wrong?
Thanks so much!
by Soraya Sadeghi 1B
Mon Oct 20, 2014 3:19 pm
Forum: Significant Figures
Topic: Rounding to 1 sig fig when there is a 5
Replies: 4
Views: 761

Re: Rounding to 1 sig fig when there is a 5

In the chem 14A workbook, it says that you should round the number up if there are digits after the 5. "For example, if we round to 2 significant figures: 2.451 * 10^2, the answer is 2.5 * 10^2 since 2.451 * 10^2 is closer to 2.5 * 10^2 than 2.4*10^2" This is quoted from the workbook. So I...
by Soraya Sadeghi 1B
Sun Oct 12, 2014 9:34 pm
Forum: Balancing Chemical Reactions
Topic: practice problem--balancing an equation
Replies: 1
Views: 515

practice problem--balancing an equation

can anyone help show me the steps to balance this equation?

KMnO4 + C3H5(OH)3 --> CO2 + H20 + K2CO3 + Mn2O2

Thanks so much!

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