Tuesday, May 31, 2011

How do you raise the ph of soil?

To change the color of my azaleas I need to change the ph of the soil. How do I do this?How do you raise the ph of soil?
your garden center has amendments for this very purpose. A good salesperson will tell you precisely what you need. it'll be something to sprinkle on the ground. Nothing complicatedHow do you raise the ph of soil?
Lime will raise the soil pH. Be very careful in applying it though.
http://www.allotment.org.uk/articles2/So

Here is a web page you could browse, I hope it helps., but do have your soil tested
to raise the ph , lime is added, but for azaleas lime is a no no, get a reading ,if 3.5 - 5.5 lea

Anybody got info on manipulating pH and water activity in foods?

I'm doing a lab project on meat and need to change the pH and water activity to desired levels.



1. I can use ascorbic acid to decrease the pH but how do I know how much to add to decrease to a specific value eg. pH 4.5?



2. In terms of water activity, I was told to use either starch or whey. But again, to decrease to a value of 0.9 and 0.8, how much do I need to put?



Thanks! :)Anybody got info on manipulating pH and water activity in foods?
use the Pearson's chi square test

How do buffers reduce changes in pH when hydrogen ions or hydroxide ions are added to a solution?

I have a homework in Biology and this is one of the questions. Can you help me answer it?How do buffers reduce changes in pH when hydrogen ions or hydroxide ions are added to a solution?
Buffers are weak acids and their bases. When you add an acid, you change the base to the weak acid. When you add base, you change the acid to the weak base. There is a limit to their buffering capacity depending on the concentration of the buffer.

How to calculate the amount of buffer needed to keep a solution at stable pH?

I have a solution (1.5L) that while it degrades changes its pH from 7 to about 3.5. I need to add a phosphate buffer {[(Na2HPO4 5.7g)+(KH2PO4 3.6g)]/L} to keep it stable at pH 7. How do I calculate the amount of buffer needed?How to calculate the amount of buffer needed to keep a solution at stable pH?
you can't, you can only determine it empirically. A buffer will only control the pH at up to1pH unit each side of a pKa value. Outside of that, it is not buffered.

How do buffers reduce change in the pH of solutions? Why is this important to living organisms?

It's called the common-ion effect. On both sides of the equation we have conjugate pairs of molecules, and each push the reaction both ways, effectively limiting the range of pH change. In the example below, HCO3- pushes the reaction to the left, while CO2 pushes the reaction to the right. If we push the rxn to the right, we can see we are producing more H+ (lowering the pH). If we push the rxn to the left, we are _using up_ the H+ (raising pH). This equilibrium is what allows for the pH to remain relatively stable.



CO2 + H20 %26lt;-%26gt; H2CO3 %26lt;-%26gt; HCO3- + H+



Why is a buffer important? Many living organisms, organelles, and proteins require a certain pH level for optimum metabolism and activity. If there weren't a solid way for the pH to be monitored for changes, then the enzymes in your body would break down and be rendered useless. This can cause serious complications if very key enzymes are damaged.
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  • Monday, November 22, 2010

    How Do I calculate the pH of water after adding 500 ml of 1 M acetic acid (Ka = 1.8 x10-5) to 500 ml of H2O?

    How do I calculate the change in pH, following (i) the addition of 500 ml of 1M Ba(OH)2 to 500 ml of 2O, and (ii) the addition of 500 ml of 1 M acetic acid (Ka = 1.8 x10-5) to 500 ml of H2O.How Do I calculate the pH of water after adding 500 ml of 1 M acetic acid (Ka = 1.8 x10-5) to 500 ml of H2O?
    Ka= [H+]^2/[CH3COOH] so [H+]=sqrt([0.5]xKa) then pH=-log[H+]

    Sperm changes the ph level in my vagina. Which creates a foul odor and discharge. How can I prevent that?

    Is there something that I can take daily to prevent this? Or is there something I can do to control the ph levels of my vagina? I know that absence of sperm would be the answer, but what if I'm trying to concieve?Sperm changes the ph level in my vagina. Which creates a foul odor and discharge. How can I prevent that?
    well i would say use condoms but since you're trying to conceive that wouldn't work. i know some women douche but that really isn't helpful because it messes with the natural pH too. so i guess just take a shower after you have sex and wash down there very well, being careful not to get any soap in your vagina because that could cause irritation. hope that helps!Sperm changes the ph level in my vagina. Which creates a foul odor and discharge. How can I prevent that?
    your partner may need his sperm tested ,,