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Problem of the Week Archive

Collection of all our problem of the week threads.

670 Posts
59 Topics

Last post by wildfyr
in MOVED: Synthesis of N-Ac...
on January 04, 2020, 11:44:41 AM

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Stoichiometry calculator

Started by Borek | Last post by wildfyr December 31, 2018, 02:39:30 PM

3 Replies
38327 Views
Last post December 31, 2018, 02:39:30 PM
by wildfyr
Need help with an "equilibrium constant" lab report

Started by meme | Last post by hmx9123 May 01, 2004, 11:42:55 PM

7 Replies
122702 Views
Last post May 01, 2004, 11:42:55 PM
by hmx9123
Determining the Kb from the Ka

Started by hunter457 | Last post by Borek November 09, 2009, 03:15:31 AM

3 Replies
112394 Views
Last post November 09, 2009, 03:15:31 AM
by Borek
how do you calculate the net charge of a peptide?

Started by elyse07 | Last post by Yggdrasil September 06, 2010, 04:30:35 PM

4 Replies
92578 Views
Last post September 06, 2010, 04:30:35 PM
by Yggdrasil
calculating number of ions

Started by hokychik | Last post by hokychik January 21, 2012, 06:17:37 PM

6 Replies
90996 Views
Last post January 21, 2012, 06:17:37 PM
by hokychik
Al + NaOH --> Al(OH)4 not Al(OH)3?

Started by zeoblade | Last post by bubblegumpi August 09, 2017, 10:59:33 AM

6 Replies
87372 Views
Last post August 09, 2017, 10:59:33 AM
by bubblegumpi
How do you know if its a gas, solid, or liquid?

Started by lhunt | Last post by fledarmus December 12, 2011, 04:08:51 PM

8 Replies
83103 Views
Last post December 12, 2011, 04:08:51 PM
by fledarmus
NH3 and CH3COOH Neutralization Reaction: Completion?

Started by no_audio | Last post by Dan July 11, 2011, 03:42:35 AM

2 Replies
81686 Views
Last post July 11, 2011, 03:42:35 AM
by Dan
citrate phosphate buffer

Started by hopes | Last post by Borek April 14, 2005, 06:58:17 PM

12 Replies
81284 Views
Last post April 14, 2005, 06:58:17 PM
by Borek
Boyle/Charles/Gay-Lussac to Combined - How?

Started by madisonwi | Last post by madisonwi January 21, 2005, 07:23:23 PM

5 Replies
80939 Views
Last post January 21, 2005, 07:23:23 PM
by madisonwi
Is NaCl a base?

Started by gonzo | Last post by gonzo October 17, 2007, 01:18:05 PM

9 Replies
78669 Views
Last post October 17, 2007, 01:18:05 PM
by gonzo
neutralization of NH3 and HCl

Started by lmonte | Last post by AWK June 21, 2005, 02:43:56 AM

1 Replies
76954 Views
Last post June 21, 2005, 02:43:56 AM
by AWK
is NH4+ Ammonium a strong or weak acid? and what is NH3 then?

Started by bugmento | Last post by nj_bartel July 31, 2009, 11:03:09 PM

1 Replies
76887 Views
Last post July 31, 2009, 11:03:09 PM
by nj_bartel
Storing Acetone

Started by razorm | Last post by jdurg May 09, 2005, 05:00:18 PM

13 Replies
71221 Views
Last post May 09, 2005, 05:00:18 PM
by jdurg
1 % HCL solution

Started by clinicalMT | Last post by whywhywhy September 17, 2004, 10:04:46 AM

3 Replies
70106 Views
Last post September 17, 2004, 10:04:46 AM
by whywhywhy
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