Acidity-Basicity Of An Aqueous Solution

**Strings (S _{i}P_{j}A_{jk}) = S_{7}P_{5}A_{51} Base Sequence = 12735 String Sequence = 12735 - 5 - 51 **

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Acidity-Basicity Of An Aqueous Solution

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Assuming complete ionization, determine:

(a) the pH of 0.0001 N HCl (Hydrocloric acid)

(b) the pOH of KOH (potassium hydroxide)

**The strings**:

S_{7}P_{5}A_{51} (Change - Physical Change).
**The math**:

Pj Problem of Interest is of type *change* (physical change).

pH = -log[H^{+}], where [H^{+}] is hydrogen ion concentration.

pOH = -log[OH^{-}], where [OH^{-}] is hydroxide ion concentration.

Normality (N) = number of equivalents of H^{+} per liter of solution.

(a) ionization of HCl:

HCl <-------> H^{+} + Cl^{-} ----(1)

Reaction (1) indicates [H^{+}] = [HCl] since ionization is complete

So, [H^{+}] = 0.0001 = 10^{-4} N (normality = molarity)

So, pH = -log10^{-4} = 4.

(b) ionization of KOH:

KOH <-------> Na^{+} + OH^{-} ----(2)

Reaction (2) indicates [OH^{-}] = [KOH] since ionization is complete

So, [OH^{-}] = 0.0001 = 10^{-4} N (normality = molarity)

So, pOH = -log10^{-4} = 4.

The *point* **.** is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.

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