Question #e41ef

1 Answer
Dec 3, 2017

Answer:

(a) 38.73 ml

(b) 30.79 ml

Explanation:

Adipic acid is di - protic:

#sf(H_2X+2NaOHrarrNa_2X+2H_2O)#

#sf(M_r=146.14)#

The no. moles of #sf(H_2X)# is given by:

#sf(n_(H_2X)=m/M_r=0.283/146.14=0.0019365)#

From the equation we can say that the no. moles of #sf(NaOH)# must be twice that:

#sf(n_(NaOH)=2xx0.0019365=0.003873)#

#sf(c=n/v)#

#:.##sf(v=n/c=0.003873/0.1000=0.03373color(white)(x)L)#

#sf(v=38.73color(white)(x)ml)#

(b)

Now the acid is 74% pure:

#sf(m_(H_2X)=0.304xx0.74=0.22496color(white)(x)g)#

#sf(n_(H_2X)=m/M_r=0.22496/146.14=0.00153934)#

#:.##sf(n_(NaOH)=0.00153934xx2=0.00307869)#

#sf(v=n/c=0.0030786/0.1000=0.0307869color(white)(x)L)#

#sf(v=30.79color(white)(x)ml)#