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 91 
 on: March 15, 2019, 09:40:48 AM 
Started by AussieKenDoll - Last post by AWK
For electrolyte of type 1:1 (sodium acetate) good approximation for I is c(sodium acetate). The acetic acid in this solution dissociates much less than 1 %.
What does mean CH3 ?

 92 
 on: March 15, 2019, 08:29:00 AM 
Started by AussieKenDoll - Last post by AussieKenDoll
On acetic acid-sodium acetate, there are CH3COO-,CH3+, Na+,H+ ions

0.1=1/2 [(C(+1)^2+C(-1)^2+C(+1)^2+C(-1)^2 )]
0.1=2C
C=0.05 mol dm^(-3)
CV=K
0.1mol dm^(-3)×V1=0.05 mol dm^(-3)×V2
V2/V1 =2
Make 0.05M Acetic acid/Sodium acetate buffer by taking a specific volume of the buffer and diluting buffer 2 times to achieve 0.05M.
Is this correct way of preparing an acetic acid-sodium acetate buffer of the same pH and I=0.1?

 93 
 on: March 15, 2019, 08:03:51 AM 
Started by AussieKenDoll - Last post by AWK
What is the buffer action by balanced equation when HCl and NaOH added to a Tris hydrochloride-Tris buffer
Tris is a primary amine (RNH2), Tris.HCl RNH3Cl) is a salt of this amine. In reactions treat them analogously to NH3 and NH4Cl.

 94 
 on: March 15, 2019, 07:25:34 AM 
Started by QuiteThePredicament - Last post by QuiteThePredicament
Nice, that was all. Thanks for clarifying.     

 95 
 on: March 15, 2019, 06:30:48 AM 
Started by QuiteThePredicament - Last post by mjc123
If I understand you correctly, yes.

 96 
 on: March 15, 2019, 04:43:00 AM 
Started by QuiteThePredicament - Last post by QuiteThePredicament
Not generally; see what I wrote about Q on post#19. Same applies to K (= value of Q at equilibrium). Pressures or concentrations must be referenced to the standard state, and therefore the value of K will vary with the standard state chosen, unless the number of moles is equal on both sides of the equation. More precisely
K(P°2) = K(P°1) * (P°1/P°2)Δn where Δn is the change in number of moles.
The value of K will always be constant at a given temperature as long as you use the same standard state for reference, whatever the actual reaction conditions.
     
The ΔG, recorded at the conditions which are defined as the standard state can be used as ΔG° to calculate all K values for the same reaction that take place within the same temperature, but changing the definition would require me to adjust the K for the new ones. Like using a 2m long stick to measure the length of a road, calling it x units, then use a 3m one, and that y. I'd have to adjust the values I get when switching from x to y. The length of the road can be described at K, which would stay the same when I keep everything the same, but change my method of measuring.     
Measuring different roads with the x units (Same reaction and same temp K, but at different pressure/conc since I can only change the quantity that my x method measures, for this to be consistent, changing temp would be same as changing the curvature of the road which'd mess up everything) would also yield the same results as long as I adjust everything else to comply with the new meter to x ratio. Using this analogy to simplify it has helped me understand. Is it correct though?

 97 
 on: March 15, 2019, 03:57:20 AM 
Started by AussieKenDoll - Last post by Babcock_Hall
What do you know about ionic strength and pKa values?

 98 
 on: March 15, 2019, 03:56:04 AM 
Started by AussieKenDoll - Last post by Babcock_Hall
Tris is usually sold as a base, but I have on occasion seen it sold as its hydrochloride salt, which is the conjugate acid of Tris base.  It is a commonly used buffer in biochemistry, with certain things to recommend it, as well as some shortcomings.

 99 
 on: March 15, 2019, 03:54:48 AM 
Started by QuantumCore - Last post by Mitch
Radioactive waste would be labeled more clearly, no matter the jurisdiction. But, you can buy Geiger counters online to assuage your radioactive concerns.

 100 
 on: March 15, 2019, 03:52:53 AM 
Started by xchcui - Last post by Mitch
In the end, it will be cheaper to buy a new printer. But, I would take it to the hardware store and see if you could find a good match for that rubber.

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