[MecatronVels]

In the titration, in the presence of methyl orange, 1000 g of a sample containing only NaOH and Na_2CO_3, 43.25 ml of a solution of HCL  0.5000 mol/L were consumed. It can be concluded that this sample contains

a)  40% of NaCH and 60%  Na_2CO_3

b)  45% of  NaCH  and 55%  of  Na_2CO_3

c)  50% of  NaCH  and  50%  of  Na_2CO_3

d)  55%  of  NaCH  and  45%  of Na_2CO_3

e) 60%  of NaCH and 40% of  Na_2CO_3

 Can anyone give me at least a tip?

[Borek]

http://www.titrations.info/acid-base-titration-sodium-hydroxide-and-carbonate

[MecatronVels]

http://www.titrations.info/acid-base-titration-sodium-hydroxide-and-carbonate

Is this a general case of my problem?

[mjc123]

The question as written does not give a sensible answer. Should the sample be 1.000 g?

[MecatronVels]

The question as written does not give a sensible answer. Should the sample be 1.000 g?

I think so.

[Borek]

Is this a general case of my problem?

In a way. It should help you understand what is being titrated and why the choice of indicator matters.