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Need a manual for airconditioner PKA-RP35HAL - Heating & Cooling

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Will the lenses I am using on my old school Pentax PZ1 SLR camera fit on Pentax digital cameras?


If the lenses are PK / PKA bayonet fitting, yes - if they are autofocus as well, this is a bonus, as that too should work. If they are M42 screw-fit, then you'll need an adapter, and all functions (zoom, focus, exposure) will be strictly manual.

Dec 20, 2015 | Pentax Cameras

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Can you show me how to find the ration between ph and pka?


There is not a simple ratio between these two. See: What is the relationship between PH and pKa - Wiki Answers

wiki.answers.com > Wiki Answers > Categories > Science > Chemistry
when pKa = pH, there is equal concentration of acid and its conjugate base. pKa helps to understand the nature of acid and base like pH: .... Related topics: .pka ...

Jan 28, 2014 | Personalised Grandmas Wish List Print, Not...

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I need to punch in: -log 10 Ka to get pKa,how do i do that? let's say Ka = 1.75 X 10^-5 the answer = 4.76 pKa = -log 10 Ka show me step by step how to punch in. thanks!


(-) LOG 1 . 7 5 EE (-) 5 ENTER

The (-) is just to the right of the decimal point, the LOG key is in the leftmost column between the GRAPH and LN keys, the EE key is just above the 7 key.

Dec 11, 2010 | Texas Instruments TI-85 Calculator

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Please explain which buttons to push on TI-36x solar calculator to find the pKa of benzoic acid. the Ka for benzoic acid is 6.5 X 10 to the -5th ? (Sorry I don't know how to type the exponents for you)


You need the [EE] key to enter powers of 10 exponents.
You need the change sign key [+/-] key.
You need the [LOG] key.

pKa: 6.5 [EE] [+/-] 5 [LOG] [+/-]
There are two change sign: The first (either before or after the exponent 5), the last is entered after you press the log key , so as to negate (make negative if result is positive, and make positive is result is negative) the value.
The result should be 4.1870866 or 4.19

Mar 08, 2010 | Texas Instruments TI-36 X Solar Calculator

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How to use the log function for acidity constants? I get a syntax error


Hi,
Let Ka be the acidity constant (acid dissociation constant). The pKa is defined as the negative of the log in base 10 of the acidity constant.
pKa= - log_10(Ka) where log_10 is the logarithm in base 10.

To calculate the pKa you use the key labeled [LOG], just above [COS]. Be careful with the negative sign: For that, you use the key [(-)] just above the RCL key. Press the keys in the order specified below

pKa = [(-)] [LOG] number [ ) ] [=]

Although the right parenthesis is not required in this particular case, it is better to accustom oneself to close the parenthesis.

Hope it helps.

Dec 07, 2009 | Casio FX-115ES Scientific Calculator

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How to find pka value


Hello,
If I guessed right you are talking about the Chemistry notion of the pKa
Let the equilibrium constant be Ka =1.8x10^(-5). Then by definition pKa=-log(Ka) , log in base 10
pKa = - log(1.8x 10^(-5))
First set [MODE] to [COMP] by pressing [MODE] 1.
[LOG] [(] 1.8 [x] [SHIFT] [10 to the x] [(-)] 5 [)] . [(-)]
The [(-)] key is the change sign key : a small - between parentheses. The last [(-)] sign in the expression takes the negative of the whole calculation to obtain the correct value of the pKa.
The value you should find for the above exemple is 4.74

Hope it helps.


Dec 17, 2008 | Casio FX-115MS Plus Calculator

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