Search found 118 matches

by Dhamnekar Winod
Fri Apr 09, 2021 11:22 pm
Forum: Chemistry forum
Topic: Finding out pH of the solution
Replies: 8
Views: 72

Re: Finding out pH of the solution

Answer to question c. Handerson-Hasselbalch equation = pKa + log ([conjugate base]/ [weak acid]) pH =pKa + log ([A⁻][HA]) , Hence, pH= 4.74 + log ( 0.127/0.095)= 4.84 Original Concentration of Vinegar - added concentration of 0.005M KOH =0.1 M -0.005 M KOH = 0.095 M Original concentration of sodium ...
by Dhamnekar Winod
Fri Apr 09, 2021 9:38 am
Forum: Chemistry forum
Topic: Finding out pH of the solution
Replies: 8
Views: 72

Re: Finding out pH of the solution

Answer to question b.

\( pH = 4.77 + log (\frac{0.1215}{0.1005})=4.85\)

Is this answer correct?
by Dhamnekar Winod
Fri Apr 09, 2021 12:54 am
Forum: Chemistry forum
Topic: Finding out pH of the solution
Replies: 8
Views: 72

Re: Finding out pH of the solution

Yes. Chemical reaction was wrongly written by me. Thanks for pointing out my mistake. I have corrected the chemical reaction now. is that correct?
by Dhamnekar Winod
Thu Apr 08, 2021 10:14 pm
Forum: Chemistry forum
Topic: Finding out pH of the solution
Replies: 8
Views: 72

Re: Finding out pH of the solution

Answer to question a.




\(pK_a\) for Ethanoic acid =4.77,\( pH= 4.77 + log(\frac{0.122 M }{0.1 M })=4.85\)
by Dhamnekar Winod
Wed Apr 07, 2021 7:09 am
Forum: Chemistry forum
Topic: Finding out pH of the solution
Replies: 8
Views: 72

Finding out pH of the solution

6.00 g acetic acid and 10.00 g sodium acetate are dissolved in enough water to make 1 L of solution. a.What is the pH of the solution? b.If 5 mL of 0.1 M HCl are added to the solution, what is the new pH? c.If instead 5 mL of 1.0 M KOH are added to the original solution, what is the new pH? I am wor...
by Dhamnekar Winod
Tue Apr 06, 2021 7:19 am
Forum: Chemistry forum
Topic: pH determination problems
Replies: 7
Views: 86

Re: pH determination problems

Your answer to question e for pH of 1 M solution of KHSO3(Potassium Hydrogen Sulfite) is acidic. But my pH computation work result is different. KHSO3 + H2O ⇌ H2SO3 + KOH K_a = \frac{K_w}{K_b}= \frac{1e-14}{1.5e-2}=\frac{x\cdot x}{1 M}= 6.66e-13,x= 8.16e-7,pOH=6.088,pH=7.911 So, the 1 M solution of ...
by Dhamnekar Winod
Mon Apr 05, 2021 9:48 am
Forum: Chemistry forum
Topic: pH determination problems
Replies: 7
Views: 86

Re: pH determination problems

You are correct. Answer for question a is alkaline. Following is my chemistry work. I computed the pH of 1.0 M solution of NaHS as follows:- NaHS + H2O ⇌ NaOH + H2S K_a of HS = 1.2e-13 = \frac{[NaOH])[H_2S]}{[1.0M]} Concentration of H2S is = \sqrt{1.2e-13}=[3.46e-7] We got concentration of H2S. Ioni...
by Dhamnekar Winod
Mon Apr 05, 2021 5:15 am
Forum: Chemistry forum
Topic: pH determination problems
Replies: 7
Views: 86

Re: pH determination problems

All the 1 M aqueous solutions of the substances in the questions a, b, c, d, e, f are acidic.
by Dhamnekar Winod
Sat Apr 03, 2021 7:29 am
Forum: Chemistry forum
Topic: pH determination problems
Replies: 7
Views: 86

pH determination problems

Determine whether each of the following 1 M solutions is acidic, basic, or neutral.
a.NaHS
b.NaBr
c.NH4Ac (remember Ac = acetate)
d.KNO2
e.KHSO3
f.NaH2PO4

I am working on these questions.
by Dhamnekar Winod
Sat Apr 03, 2021 5:36 am
Forum: Chemistry forum
Topic: Atomic weight question 2
Replies: 3
Views: 46

Re: Atomic weight question 2

If Carbon consisted of only one naturally-occurring isotopes \(-^{12}C-\),the atomic weight of Carbon would be 11.867 g. The atomic weight of Lead would be 204.716 g.
by Dhamnekar Winod
Fri Apr 02, 2021 11:32 pm
Forum: Chemistry forum
Topic: Atomic weight question
Replies: 3
Views: 48

Re: Atomic weight question

If carbon were assigned an atomic weight of 20, the atomic weight of Hydrogen and Silicon are 1.665 g and 46.76 g respectively.
by Dhamnekar Winod
Fri Apr 02, 2021 10:57 pm
Forum: Chemistry forum
Topic: How to find atomic weight of unknown element?
Replies: 2
Views: 35

Re: How to find atomic weight of unknown element?

The other unknown element reacted with dioxygen is Silver(Ag).

The atomic weights of Silver is 107.87 g.
The chemical reaction is \(2M_2 + O_2\rightarrow 2M_2O\) Where M is Ag.
by Dhamnekar Winod
Fri Apr 02, 2021 9:30 am
Forum: Chemistry forum
Topic: Atomic weight question 2
Replies: 3
Views: 46

Atomic weight question 2

If carbon consisted of only one naturally-occurring isotope \(-^{12}C-\), what would be the atomic weight of carbon? What would be the atomic weight of lead?
by Dhamnekar Winod
Fri Apr 02, 2021 9:19 am
Forum: Chemistry forum
Topic: Atomic weight question
Replies: 3
Views: 48

Atomic weight question

If carbon were assigned an atomic weight of 20, what would be the atomic weight of Hydrogen and Siicon?
by Dhamnekar Winod
Fri Apr 02, 2021 9:16 am
Forum: Chemistry forum
Topic: How to find atomic weight of unknown element?
Replies: 2
Views: 35

How to find atomic weight of unknown element?

A 431 milligram sample of an element reacted with 32 milligram of O2 to form a compound with the formula M2O. Compute the atomic weight of element.