You have a different rock with a volume of 30cm3 and a mass of 60g
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pH of buffer solution : 4.32
<h3>Further explanation </h3>A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solutions consist of weak acids(H₂CO₃) and their salts.(NaHCO₃)
mol H₂CO₃
mol NaHCO₃