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Chapter 17: Q32P (page 430)

The drug Librium gives a polarographic wave withE1/2=-0.265V(versus S.C.E.) in 0.05MH2SO4. A 50.0 - Mlsample containing Librium gave a wave height of0.37μA. When 2.00mLof 3.00mMLibrium in0.05MH2SO4were added to the sample, the wave height increased to0.80μA. Find the molarity of Librium in the unknown.

Short Answer

Expert verified

The concentration of Librium in given unknown solution is 0.096mM .

Step by step solution

01

Define Molarity.

Molarity can be defined as the moles of solute (in grams) to the volume of the solution (in litres). The molarity of a solution can be given by the formula,

MolarityM=MolesofsoluteingVolumeofsolutioninL

02

 Determine the Molarity of Librium.

Given,

0.05MH2SO4

lx=0.37μA(wave height)

ls=0.80μA(wave height after addition of sulfuric acid)

XiSf+Xf=lxls+XxmM3.0mM2.00mL52.00mL+xmM50.0052.00=0.37μA0.80μAx0.1154mM+0.9615xmM=0.4625x=0.4625×0.1154mM+0.9615xmM0.553x=0.0534x=0.096mM

The concentration of Librium in given unknown solution is 0.096mM .

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Most popular questions from this chapter

Chlorine has been used for decades to disinfect drinking water. An undesirable side effect of this treatment is reaction with organic impurities to create organochlorine compounds, some of which could be toxic. Monitoring total organic halide (designated TOX) is required for many water providers. A standard procedure for TOX is to pass water through activated charcoal, which adsorbs organic compounds. Then the charcoal is combusted to liberate hydrogen halides:

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