I love only two things My children and The rest of the world
x*n
7 楼
Hi, I am trying to repeat an experiment from a published paper, but I got confused about one thing. The process need a PH 3 solution with 8 M urea. The author adjusted the pH by 0.1% acetic acid. However, the PKa of acetic acid is 4.75. Should not the buffer always be arround 4.75 no matter how much acetic acid I am adding? In another word, what decides the final pH, the PKa or the concentration of the acid? Thanks!
The rest of the world including all other things. haha :)
【在 S*******t 的大作中提到】 : I love only two things : My children and : The rest of the world
O*R
13 楼
both pH=pKa+log([A]/[HA])
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【在 x*****n 的大作中提到】 : Hi, I am trying to repeat an experiment from a published paper, but I got : confused about one thing. : The process need a PH 3 solution with 8 M urea. The author adjusted the pH : by 0.1% acetic acid. : However, the PKa of acetic acid is 4.75. Should not the buffer always be : arround 4.75 no matter how much acetic acid I am adding? : In another word, what decides the final pH, the PKa or the concentration of : the acid? : Thanks! :
The last two years have been golden era for junk bond financing. The companies have mostly refinanced their higher interest debt to lower ones. And the equity market signals that economy is coming back, which means "junk " companies should see better profits. So junk bond should be a buy now. The only concern is that recently issued junk bonds have provisions which is at better advantage of the junk companies. The provisions could post big risk when the company is in default. just be aware of this risk.
s*t
16 楼
这个很有意思,让我想起了两行情诗,忘了是谁写的了。 我只爱你 以及你所在的世界
【在 S*******t 的大作中提到】 : I love only two things : My children and : The rest of the world
A lot of corporate bonds and some muni bonds have a call option built in, which means that even if you purchased them today at a coupon rate, they can be recalled. Also if you sell before maturity, their principal value can fluctuate depends on the market, so yield can go down.
A lot of corporate bonds and some muni bonds have a call option built in, which means that even if you purchased them today at a coupon rate, they can be recalled. Also if you sell before maturity, their principal value can fluctuate depends on the market, so yield can go down.