Calculating Hydrogen Ion Concentration & PH by Yonderboy98

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To calculate hydrogen ion concentration from pH, use the formula [H+] = 10^(-pH). For a pH of 3.5, the hydrogen ion concentration is 3.16 x 10^(-4) M. For a pH of 7.2, the concentration is 6.31 x 10^(-8) M. To find pH from hydrogen ion concentration, use pH = -log([H+]). For a concentration of 2.8 x 10^(-15) M, the pH is approximately 14.55, and for 3.6 x 10^(-9) M, the pH is about 8.44.
Yonderboy98
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I know what the formal definition of ph is, and I am comfortable with logarithms, anti-logs, and the laws of exponents. Still, I get confused doing actual calculations and would greatly appreciate your input on the following:
Suppose something has a ph of 3.5-How do you calculate the hydrogen ion concentration?
Suppose something has a ph of 7.2- How do you calculate the hysdrogen ion concentration?
Suppose that something has a hydrogen ion concentration of 2.8 times ten to the minus 15-How do you calculate its ph?
Suppose that something has a hydrogen ion concentration of 3.6 times ten to the minus 9-How do you calculate its ph? Yonderboy98
 
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[H+] = 10-pH
pH = -log([H+])

That's all.
 
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