The **ionic **strength of the solution is the measure of the ion concentration in the solution.It is represented as** I**. It affects the ion activity. It represents with the ion interaction with water molecules and other ion in solution. The ionic strength formula is used to calculate the half of sum total concentration of each ionic species.

Ionic strength formula is given by

where C

z is the valence.

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Given:

Ions | Z |
C |
Z^{2} |

K^{+} |
1 | 2 |
1 |

Cl^{-} |
1 | 2 |
1 |

The ionic strength is given by

I = $\frac{1}{2}$ [(2 $\times$ 1) + (2 $\times$ 1)]

= 2

Given

Ions | Z |
C | Z^{2} |

K^{+} | 1 | 2 | 1 |

SO_{4-2} |
2 | 1 | 4 |

The ionic strength is given by

I = $\frac{1}{2}$ [(2 $\times$ 1) + (1 $\times$ 4)]

= 3

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