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3 years ago

Does anyone know What does pH= ?

Chemistry

2 answers:

Lesechka [4]3 years ago

4 0

Answer: Yes. The pH = 7.6   .
___________________________________________________
Explanation:
____________________________________________________

pH = - log [H⁺]   ; in which, by convention, we assume that there
                            is an implied "base 10" if there is no number listed as a
                            "base" under the "log" sign;

i.e. , " pH = - log [H⁺]⁺ = - log₍₁₀₎ [H⁺] ;
________________________________________________
in which, the: " [H⁺] " refers to the concentration of hydrogen ions, or " H⁺ " ; in "Molarity" ; that is: "moles of solutes per Liters of solution", or "mol / L", or "M" .
________________________________________________
Likewise, "pOH = - log [OH⁻] = - log₍₁₀₎ [OH⁻] " .
________________________________________________
Note: pH + pOH = 14 .
________________________________________________
So, given: "A solution with 6.4 * 10⁻¹⁰ M OH (in our problem), find the "pH".
_________________________________________________
   The pOH of the solution is 6.4 .
_________________________________________________
Since pH + pOH = 14 ;
               we can substitute "6.4" for "pOH" ; and solve for "pH":
_________________________________________________
      pH + 6.4 = 14 ;

        Subtract "6.4" from each side of the equation; to isolate "pH" on one side of the equation; and to solve for the "pH" ;
_________________________________________________
      pH + 6.4 − 6.4 = 14 − 6.4 ;
_________________________________________________
      pH = 7.6   .
_________________________________________________

LiRa [457]3 years ago

3 0

If i am not mistake u can use -log[concentration of oh-] to find it
ie -log[6.4*10^-10]=9.19

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See explanation

Explanation:

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Percentage oxygen = (16 amu/44.014 amu) * 100% = 36.4 %

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b) Benzoic acid (C7H6O2) has a molar mass of 122.13 amu. It has 6 hydrogen atoms each with a mass of 1.01 amu; it has 7 carbon atoms each with a mass of 12.01amu and 2 oxygen atoms with a mass of 16.0 amu.

Percentage hydrogen = (6*1.01 amu / 122.13 amu)*100% = 4.96%

Percentage carbon = (7*12.01 amu/ 122.13 amu)*100% = 68.8%

Percentage oxygen = (2*16 amu/ 122.13 amu) *100% = 26.2%

c) Magnesium hydroxide (Mg(OH)2) has a molecular mass of 58.32 amu. It has 2 hydrogen atoms each with a mass of 1.01 amu; it has 1 magnesium atom with a mass of 24.3 amu and two oxygen atoms with a mass of 16.0 amu.

Percentage hydrogen = (2*1.01 amu/ 58.32 amu) *100% = 3.46 %

Percentage magnesium = (24.3 amu/58.32 amu)*100% = 41.7%

Percentage oxygen = (2*16 amu/58.32 amu)*100% = 54.9%

d) Urea CO(NH2)2 has a molecular mass of 60.064 amu. It has 2 Nitrogen atoms each with a mass of 14.007 amu, 4 hydrogen atoms each with a mass of 1.01 amu,1 carbon atom with a mass of 12.01 amu and 1 oxygen atom with a mass of 16.0 amu.

Percentage nitrogen = (2*14.007 amu/ 60.064amu)*100% = 46.6%

Percentage hydrogen = (4*1.01 amu/60.064amu)*100% = 6.72%

Percentage carbon = (12.01 amu/60.064amu)*100% = 20.0%

Percentage oxygen = (16 amu/60.064amu)*100% = 26.6%

e) Osopentyl acetate (C7H14O2) has a molecular mass of 130.2 amu. It has 14 hydrogen atoms each with a mass of 1.01 amu,7 carbon atoms each with a mass of 12.01 amu and 2 oxygen atom with a mass of 16.0 amu.

Percentage hydrogen = (14*1.01 amu/130.2 amu)*100% = 10.8%

Percentage carbon = (7*12.01 amu/130.2 amu)*100% = 64.6%

Percentage oxygen =(2*16 amu/130.2 amu)*100% = 24.6%

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