Which term is the symbol for the negative logarithm of the hydrogen ion concentration?

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Multiple Choice

Which term is the symbol for the negative logarithm of the hydrogen ion concentration?

Explanation:
pH is the negative logarithm of the hydrogen ion concentration, defined as pH = -log10[H+]. This quantity directly reflects acidity: as [H+] increases, pH decreases (more acidic), and as [H+] decreases, pH increases (less acidic). It’s different from pOH, which is -log10[OH−], and from pKw, which is the sum of pH and pOH (about 14 at room temperature). pKa is the negative log of the acid dissociation constant Ka and relates to how easily an acid donates a proton, not to [H+] itself. For example, [H+] = 1×10−7 M gives pH 7, while [H+] = 1×10−3 M gives pH 3.

pH is the negative logarithm of the hydrogen ion concentration, defined as pH = -log10[H+]. This quantity directly reflects acidity: as [H+] increases, pH decreases (more acidic), and as [H+] decreases, pH increases (less acidic). It’s different from pOH, which is -log10[OH−], and from pKw, which is the sum of pH and pOH (about 14 at room temperature). pKa is the negative log of the acid dissociation constant Ka and relates to how easily an acid donates a proton, not to [H+] itself. For example, [H+] = 1×10−7 M gives pH 7, while [H+] = 1×10−3 M gives pH 3.

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