The overall stability constant of the complex ion ${\left[Cu{\left(N{H}_3\right)}_4\right]}^{2+}$  is 2.1 × 10¹³. The overall dissociation constant is y × 10^-14. Then y is __________. (Nearest integer)

<p>Stability constant of complex =<span contenteditable="false"> <math> <mrow> <mfrac> <mrow> <mn>1</mn> </mrow> <mrow> <mi>d</mi> <mi>i</mi> <mi>s</mi> <mi>s</mi> <mi>o</mi> <mi>c</mi> <mi>a</mi> <mi>t</mi> <mi>i</mi> <mi>o</mi> <mi>n</mi> <mtext> </mtext> <mtext> </mtext> <mi>c</mi> <mi>o</mi> <mi>n</mi> <mi>s</mi> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mi>t</mi> </mrow> </mfrac> </mrow> </math> </span>&nbsp;&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1815815472"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;</p><p>&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1815815478"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;<span contenteditable="false"> <math> <mrow> <mo>∴</mo> </mrow> </math> </span>Dissociation constant =<span contenteditable="false"> <math> <mrow> <mfrac> <mrow> <mn>1</mn> </mrow> <mrow> <mn>2</mn> <mo>.</mo> <mn>1</mn> <mo>×</mo> <mn>1</mn> <msup> <mrow> <mn>0</mn> </mrow> <mrow> <mn>1</mn> <mn>3</mn> </mrow> </msup> </mrow> </mfrac> <mo>=</mo> <mn>4</mn> <mo>.</mo> <mn>7</mn> <mn>6</mn> <mo>×</mo> <mn>1</mn> <msup> <mrow> <mn>0</mn> </mrow> <mrow> <mo>−</mo> <mn>1</mn> <mn>4</mn> </mrow> </msup> </mrow> </math> </span>&nbsp;&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1026" DrawAspect="Content" ObjectID="_1815815479"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;</p><p>the nearest value of dissociation constant = 5 × 10^-14</p><p>Ans. = 5</p>

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