Home | Community | Message Board


This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

PhytoExtractum Shop: Kratom Powder for Sale

Jump to first unread post Pages: 1
Invisibleshadyy
aHhahhHA
 User Gallery


Registered: 09/08/08
Posts: 21,330
Loc: winchestertonfieldville i...
brain fart - chem help
    #22363556 - 10/11/15 02:19 PM (8 years, 3 months ago)

A chemist placed a 0.7902 g sample of potassium permanganate, KMnO4 (molar mass = 158.03 g/mol) in a volumetric flask and added water to make 100.00 mL of a potassium permanganate stock solution.  She then used a volumetric pipet to transfer a portion of this stock solution to a volumetric flask and added water to make 500.00 mL of a 2.500 x 10–3 M diluted KMnO4(aq) solution.  She used this diluted solution to titrate 25.00 mL of a 1.000 x 10–2 M solution of Pb(NO3)2(aq), according to the following, balanced equation:

2 H2O(l) + 2 KMnO4(aq) + 5 Pb(NO3)2(aq) -> 5 PbO2(s) + 2 Mn(NO3)2(aq) + 2 KNO3(aq) + 4 HNO3(aq)

After the titration was completed, she filtered off the solid PbO2(s) (molar mass = 239.2 g/mol) that had formed, dried it and found the mass to be 0.0508 g.




What is the theoretical yield of PbO2?


I got 0.02392g which gets me partial credit, but I'm curious how to get the right answer?
Please don't post with no explanation!


--------------------

ga ga ga eets eets how you gone be mad on vacation?
MONICA COULDN'T TELL TIME UNTIL SHE WAS 13


Extras: Filter Print Post Top
OfflineLogicaL ChaosM
Ascension Energy & Alien UFOs
Male User Gallery


Folding@home Statistics
Registered: 05/12/07
Posts: 69,356
Loc: The Inexpressible... Flag
Last seen: 1 hour, 12 minutes
Re: brain fart - chem help [Re: shadyy]
    #22363647 - 10/11/15 02:42 PM (8 years, 3 months ago)

:mindblown:


--------------------
"What you must understand is that your physical dimension affects everyone in the higher dimensions as well. All things are interconnected. All things are One. Therefore, if one dimension is broken or out of balance, then all other dimensions will experience repercussions." - Pleiadian Prophecy 2020 The New Golden Age by James Carwin

PROJECT BLUE BOOK ANALYSIS! (312 pages!) | Psychedelics & UFOs | Ready to Contact UFOs? | The Source on Mushrooms:shroomeryhead:| Trippy Gematrix | Dj TeknoLogical | Fentanyl Test Kits R.I.P. Big Worm :tombstone: || The Start of the Ascension Process was 2020. Welcome to the Next Great Era of Earth 🌎🌍🌏                                                         
:sunny::bliss::mushroom2: Oregon Eclipse Festival 2017 :: Aug 19th - 21st :: Pure Paradise :mushroom2::bliss::sunny: :rainbowdrink: Very Effective LSA Extraction Tek :rainbowdrink: | 💧 Advanced Cold Water LSA Extraction Method 💧 | :cacti::bongload: Mescajuana - Mescaline with Marijuana | DMT Dab Bongs | UFO Technology! :shpongle:Shpongle:shpongle:   


Extras: Filter Print Post Top
OfflineGiftofdeprivation
Discerning Vagrant
Male User Gallery


Registered: 07/20/13
Posts: 3,933
Last seen: 8 years, 28 days
Re: brain fart - chem help [Re: shadyy]
    #22363674 - 10/11/15 02:45 PM (8 years, 3 months ago)

:oopswrongforum:


--------------------

Looking for recipes? Have some recipes to share?
Please post what you have in the official cooking thread for Pubbers!
HERE!
Shoutout to Azur's Official cooking thread for OTDers!
Posters Beware!


Extras: Filter Print Post Top
Offlineakira_akuma
Φύσις κρύπτεσθαι ὕψιστος φιλεῖ


Registered: 08/28/09
Posts: 82,455
Loc: Onypeirophóros
Last seen: 4 years, 1 month
Re: brain fart - chem help [Re: Giftofdeprivation]
    #22363821 - 10/11/15 03:16 PM (8 years, 3 months ago)

it looks like a simple math problem, but i don't know shit-fuck-all about math or molarity - so i'm sorry i can't help, but i appreciate the topic, it sounds interesting. hope you get your answer OP, and BTW, hope i didn't make you think you had the answer yet...someone will come along i'm sure.


Extras: Filter Print Post Top
Invisibleshadyy
aHhahhHA
 User Gallery


Registered: 09/08/08
Posts: 21,330
Loc: winchestertonfieldville i...
Re: brain fart - chem help [Re: akira_akuma] * 1
    #22364127 - 10/11/15 04:18 PM (8 years, 3 months ago)

It's cool.
Figured it out..

M = mol solute/L solution

KMnO4
(2.500 x 10^-3) (.500L) = 0.00125 mol/L 

Pb(NO3)2
(1.000 x 10^-2) (.025L) = 0.00025 mol/L


Therefore, Pb(NO3)2 is the limited reactant..

0.00025 x 239.2 = 0.0598g PbO2 <--- answer


--------------------

ga ga ga eets eets how you gone be mad on vacation?
MONICA COULDN'T TELL TIME UNTIL SHE WAS 13


Extras: Filter Print Post Top
Offlineakira_akuma
Φύσις κρύπτεσθαι ὕψιστος φιλεῖ


Registered: 08/28/09
Posts: 82,455
Loc: Onypeirophóros
Last seen: 4 years, 1 month
Re: brain fart - chem help [Re: shadyy]
    #22364134 - 10/11/15 04:19 PM (8 years, 3 months ago)

nice job.:thumbup:


Extras: Filter Print Post Top
Invisibleshadyy
aHhahhHA
 User Gallery


Registered: 09/08/08
Posts: 21,330
Loc: winchestertonfieldville i...
Re: brain fart - chem help [Re: akira_akuma] * 1
    #22364151 - 10/11/15 04:22 PM (8 years, 3 months ago)

lol thanks...once it clicks, I'm good. It's getting it to click that's the tricky part.


--------------------

ga ga ga eets eets how you gone be mad on vacation?
MONICA COULDN'T TELL TIME UNTIL SHE WAS 13


Extras: Filter Print Post Top
Offlineblackhawk
Newton's Law of Majesticity
I'm a teapot


Registered: 04/02/11
Posts: 8,465
Loc: Where Jimmies are Rustled
Last seen: 21 hours, 38 minutes
Re: brain fart - chem help [Re: shadyy]
    #22364156 - 10/11/15 04:23 PM (8 years, 3 months ago)

what chemistry is this?


--------------------


Extras: Filter Print Post Top
Invisibleshadyy
aHhahhHA
 User Gallery


Registered: 09/08/08
Posts: 21,330
Loc: winchestertonfieldville i...
Re: brain fart - chem help [Re: blackhawk]
    #22364163 - 10/11/15 04:24 PM (8 years, 3 months ago)

just gen chem I


--------------------

ga ga ga eets eets how you gone be mad on vacation?
MONICA COULDN'T TELL TIME UNTIL SHE WAS 13


Extras: Filter Print Post Top
Jump to top Pages: 1

PhytoExtractum Shop: Kratom Powder for Sale


Similar ThreadsPosterViewsRepliesLast post
* Fuck, I just had a brain fart and missed my math final.
( 1 2 all )
Konnrade 1,697 22 12/15/05 01:47 AM
by Konnrade
* having a brain fart here(maths)... DistortedEyes 654 9 11/07/06 02:43 PM
by sleepy
* Brain Fart Terrapin77 584 4 06/29/06 03:57 AM
by Terrapin77
* BrAiN destroys wikipedia BrAiN 1,315 13 04/09/05 05:13 PM
by Thin White Duke
* Woe are my molars altershroom 345 1 07/05/08 03:57 PM
by rick0909
* Farting etiquette
( 1 2 3 all )
RandalFlagg 6,132 40 09/30/05 10:38 PM
by crystallize
* Facts On Farts... Bet You Didn't Know All Of This! TM 6,583 13 09/23/06 03:20 AM
by shymanta
* Federal Antiquated law Response Team (FART) Microcosmatrix 1,112 12 11/03/05 02:29 PM
by Ripple

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Entire Staff
476 topic views. 5 members, 39 guests and 29 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.023 seconds spending 0.008 seconds on 14 queries.