On strong heating, 28.6 g of washing soda, Na2CO3.xH2O, leaves a residue of 10.6 g of anhydrous Na2CO3 (Na = 23, C = 12, O = 16, H = 1). The value of x is:

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On strong heating, $28.6 g$ of washing soda, $Na X_{2} CO X_{3} \cdot x H X_{2} O$ , leaves a residue of $10.6 g$ of anhydrous $Na X_{2} CO X_{3}$ (Na = 23, C = 12, O = 16, H = 1). The value of $x$ is:

Water lost

= 28.6 - 10.6 = 18.0

= 1.0

mol.

Na X_{2} CO X_{3}

= 10.6/106 = 0.1

mol.

x = 1.0/0.1 = 10

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