Chapter 13, Problem 9Q

Interpretation Introduction

(a)

Interpretation:

The mass of natural product codistills with water should be determined.

Concept Introduction:

The mass of the given natural product can be calculated from the partial pressure as follows:

  $\begin{array}{l}\frac{{\text{p}}_{\text{w}}}{{\text{p}}_{\text{n}}}\text{=}\frac{\frac{{\text{m}}_{\text{w}}}{{\text{M}}_{\text{w}}}}{\frac{{\text{m}}_{\text{n}}}{{\text{M}}_{\text{n}}}}\\ \frac{{\text{p}}_{\text{w}}}{{\text{p}}_{\text{n}}}=\frac{{\text{m}}_{\text{w}}}{{\text{M}}_{\text{w}}}\times \frac{{\text{M}}_{\text{n}}}{{\text{m}}_{\text{n}}}\end{array}$

Here,

p_w: partial pressure of water.

p_n: partial pressure of natural product.

M_w: molar mass of water.

M_n: molar mass of natural product.

m_w: mass of water.

m_n: mass of natural product.

Interpretation Introduction

(b)

Interpretation:

The amount of water removed by steam distillation to recover natural product from 3g of spicecontaining 10% of desired product needs to be determined.

Concept Introduction:

The amount of water removed can be calculated by taking difference of the total amount of the natural product and the percent of the desired product in the spice.