JAMB - Chemistry (2019 - No. 52)

The two ions responsible for hardness in water are

Ca\(^{2+}\) and / or Mg\(^{2+}\)

K\(^+\) and / or Mg\(^{2+}\)

Ca\(^{2+}\) and / or Li\(^+\)

Ca\(^{2+}\) and / or Na\(^+\)

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