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Log (k_a)=-4.7

-log(k_a)=4.7

-log(k_a)=0 - log(k_a)=log(1)-log (k_a)=

=**log(1/k_a**)**=4.7**

**Raise both members of the last equality to the power of 10**

10^(log(1/k_a))=**1/k_a**=10^(4.7)

**k_a=10^(-4.7)=1.99526*10^(-5)**

Posted on Mar 23, 2014

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Posted on Jan 02, 2017

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pKa=-logKa

-pKa=logKa

10^(-pKa)=10^(log(Ka))=Ka

Ka=10^(-3.89)

I don't know where you got the value you give but here is what my calculator finds.

-pKa=logKa

10^(-pKa)=10^(log(Ka))=Ka

Ka=10^(-3.89)

I don't know where you got the value you give but here is what my calculator finds.

Jan 14, 2016 | Texas Instruments TI-30 XIIS Calculator

I assume you mean

This equation contains two unknowns: k and a, so I cannot give you a numeric result, nor can a calculator. However, you can express k as a function of a, or a as a function of k:

where ln is the natural logarithm base e=2.712818...

This equation contains two unknowns: k and a, so I cannot give you a numeric result, nor can a calculator. However, you can express k as a function of a, or a as a function of k:

where ln is the natural logarithm base e=2.712818...

Mar 22, 2014 | Casio FX-115MS Plus Calculator

According to the operation priority rules

1/1*2=1*2=2

1/2*4=(1/2)*4=2

1/2*4*6=(1/2)*4*6=12

The result is 2+2+12=16

If you have a series with increasing denominators then you should use parentheses to force the calculator to do as you intended.

1/2+1/(2*4)+1/(2*4*6)

or 1/2 +1/2/4 +1/2/4/6=31/48 or 0.645833333.....3

1/1*2=1*2=2

1/2*4=(1/2)*4=2

1/2*4*6=(1/2)*4*6=12

The result is 2+2+12=16

If you have a series with increasing denominators then you should use parentheses to force the calculator to do as you intended.

1/2+1/(2*4)+1/(2*4*6)

or 1/2 +1/2/4 +1/2/4/6=31/48 or 0.645833333.....3

Oct 09, 2013 | Sharp ELW535 Calculator

No, you're not squaring a negative number, you're negating a square. When you press (-) 4 ^ 2 ENTER , the calculator is calculating -(4^2). 4^2 is 16, and the negative of that is -16. What you want to do is to calculate (-4)^2 by pressing ( (-) 4 ) ^ 2 ENTER .

Jul 11, 2011 | Texas Instruments TI-83 Plus Calculator

You didn't specify the make and model of your calculator, so I can't give you an exact keystroke sequence.

The calculator doesn't care whether a number is a whole number or not. Just do the division.

On most algebraic-logic calculators, to divide 5 into 0.45, press . 4 5 / 5 =

On an RPN or RPL calculator, press . 4 5 ENTER 5 /

On most algebraic-logic calculators, to divide 5 by 0.45, press 5 / . 4 5 =

On an RPN or RPL calculator, press 5 ENTER . 4 5 /

If you still have problems, please reply to this post specifying the make and model of the calculator you're trying to use.

The calculator doesn't care whether a number is a whole number or not. Just do the division.

On most algebraic-logic calculators, to divide 5 into 0.45, press . 4 5 / 5 =

On an RPN or RPL calculator, press . 4 5 ENTER 5 /

On most algebraic-logic calculators, to divide 5 by 0.45, press 5 / . 4 5 =

On an RPN or RPL calculator, press 5 ENTER . 4 5 /

If you still have problems, please reply to this post specifying the make and model of the calculator you're trying to use.

Mar 14, 2011 | Office Equipment & Supplies

To calculate modulo with the FX-115MS calculator, follow these steps:

e.g.: 9%4=1

9 (minus) 9 (divide) 4 (times) 4 =

so, 9-9/4*4 will yield the correct answer of 1

e.g.: 9%4=1

9 (minus) 9 (divide) 4 (times) 4 =

so, 9-9/4*4 will yield the correct answer of 1

May 25, 2010 | Casio FX-115MS Plus Calculator

- You need no calculator to do that.
- I fail to perceive any redeeming value to this endeavor of yours.
- Here are your steps.

- 69=64+1+4 =4^3 +(4/4) +4=4^(7-4) + (4/4) +4
- 69^3= {4^(7-4) + (4/4) +4}^(7-4).

Feb 25, 2010 | Texas Instruments TI-89 Calculator

there is one button ab/c beneath CALC... if u want to calculate 7 mod 4 then... u should press 7 then ab/c 4 and equal to

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

1, 3 ,4 which is 4*1=4 and 7-4=3 remainder...

Jun 29, 2009 | Casio FX-115MS Plus Calculator

Hi....by looking at the date you posted this question, you may have already found the answer, but just in case you haven't......the procedure for adding and subtracting on these calculators is completely opposite of a regular calculator. On a regular calculator, you would input 4 - 4 = 0. On these type of calculators, a number's positive or negative status is keyed in AFTER the number, instead of before it. Therefore, you input 4 + 4 - (notice you DO NOT input = at the end, but if you are in print mode, you will need to hit your total key, which looks like an asterisk, where the = would normally be, in order for the final value of your calculations to print on the paper tape.

Multiplication and division equations are done exactly as they are on a regular calculator....4 x 4 = 16.

Hope this helps. If you have your owners manual, it should also give you some examples of how to perform calculations with your calculator.

Multiplication and division equations are done exactly as they are on a regular calculator....4 x 4 = 16.

Hope this helps. If you have your owners manual, it should also give you some examples of how to perform calculations with your calculator.

Dec 11, 2008 | Canon P170-DH Calculator

In any scientific calculator log2(n) can be calculated with either ln or log function as
follows

Log2(n)= ln(n) / ln(2)

Or

Log2(n)=log(n) / log(2)

both will give nearly the same answers

Log2(n)= ln(n) / ln(2)

Or

Log2(n)=log(n) / log(2)

both will give nearly the same answers

Dec 08, 2007 | Casio FX-300MS Calculator

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