Buffer Logic
Strange, strange calculation of stamp?
I understand calculations buffer, but I do not understand the logic of the answer in my manual coutions this question: to prepare 100 ml of a buffer particularly, 63 ml of 0.2 M HC2H3O2 mixed with 37 ml of 0.2 M NaC2H3O2. What is the pH of the buffer?
0.063 L x 0.2 M = 0.0126 moles of HOAc 0.037 L x 0.2 M = 0.0074 mol NaOAc total volume = 0.100 L [HOAc] = 0.0126 mol / L = 0.100 0.126 M [NaOAc] = 0.0074 mol / 0.100 L = 0.074 M pH = pKa + log (0.074/0.126) pH = pKa - 0.23 pKa =- log (Ka) =- log (1.75x10 ^ -5) = 4.76 pH = 4.76 0.23 = 4.53
US $19.95
 |
Glyph Technology 1TB Quad Desktop Hard Drive List Price: $449.00 Sale Price: $189.00 Used From: $185.82  |
|
Glyph's GT 050Q builds upon the success of the original GT 050 and adds FireWire 800, eSATA and USB ports. With high-speed access to audio and video content, and flexible connectivity options, the GT 050Q's design features an internal power supply, whisper-quiet fan, and a 1/8" thick-brushed stainless steel faceplate... |
 |
Seagate FreeAgent Go 500 GB USB 2.0 Portable External Hard Drive ST905003FGA2E1-RK (Silver) List Price: $103.99 Sale Price: $126.89 Used From: $70.00 |
|
Take your desktop environment and all of your files to go. The FreeAgent Go portable hard drive can run more than 100 free and pay-to-use applications on any PC without installing or storing programs on the host computer... |
 |
Samsung BN96-02037A LOGIC F BUFFER BOARD ASSEMBLY OEM Original Part Sale Price: $27.87 |
|
LOGIC F BUFFER BOARD ASSEMBLY |
 |
New Case Logic Personal Portable Dvd Binder Black Koskin Holds Title Notes Slide Insert Koskin List Price: $52.13 Sale Price: $27.72 |
|
Exceptional customer service and unparalleled product expertise. |
