Why do calcium ions make water hard but sodium ions do not

Why do calcium ions make water hard but sodium ions do not

  1. A

    Calcium forms insoluble compounds with stearate ions present in soap 

  2. B

    Sodium forms insoluble compounds with stearate ions present in soap 

  3. C

    Calcium forms soluble compounds with stearate ions present in soap 

  4. D

    Both calcium and sodium forms insoluble compounds with stearate ions present in soap

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    Solution:

    Calcium forms insoluble compounds with stearate ion present in the soap causing hardening of water. 

    Ca(aq)2+2C17H35COO(aq) C17H35COO2Ca

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