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1. 2.82 2. 8.30 3. 0.00 4. 3.485 5. 12.000 6. 4.00 Sörenson also just mentions the reverse direction. That is, suppose you know the pH and you want to get to the hydrogen ion concentration ([H + ])? Here is the equation for that: [H + ] = 10¯pH That's right, ten to the minus pH gets you back to the [H + ] (called the hydrogen ion concentration). This is actually pretty easy to do with the calculator. Here's the sample problem: calculate the [H + ] from a pH of 2.45. This problem can be done very easily using your calculator. However, be warned about putting numbers into the calculator. So you enter 2nd, 10 x , (-), 2.45, enter. The answer, to the proper number of significant digits is: .00355. The pH of an acidic pond is 5. What is the hydrogen ion concentration (moles per liter)? The answer is: pH = -log (hydrogen ion concentration) The answer was .00001. Thus, 5 = -log (.00001). We'll take the formula that you started with (pH = -log([H+])) and work to the answer (solve for [H+]). pH = - log ([H+]) Given. pH = log ([H+] (-1) ) Since logarithms are like exponents, when you multiply a log by something, you can just move it to the inside of log as an exponent. 10 pH = 10 log ([H+] (-1)) Take each side to tenth power. 10 pH = [H+] (-1) Since "log" is just another notation for "log base 10", when you raise a log to the tenth power, the log cancels out. [H+] = 10 (-pH) Take the reciprocal of both sides. That is the general form. To answer the specific question, 5 = - log ([H+]) 5 = log ([H+] (-1) ) 10 5 = [H+] (-1) 10 (-5) = [H+] [H+] = .00001 mol/L
On your calculator you would input 10, ^, (-), 5 and you would get 0.00001. This is also the way to find the amount of OH + that are present in a base. To find the pH: -log(concentration) To find the concentration: 10 -pH Define these terms: pH scale Hydronium ion Arrhenius acid/base Lewis acid/base Bronsted-Lowry acid/base Strong acid/base Weak acid/base Neutralization reaction Titration
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Enmanuel’s Chemistry Notebook
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Define Atomic Size: The size of the
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Beta Particle Decay Beta decay is a
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we can determine that 2 moles of HC
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