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7. A 0.5 gram sample of hoodia gordonii isolated from natural sources yields an observed rotation of -0.76° when dissolved in 20 mL of chloroform and placed in a 1-dm cell. Determine the specific rotation [α] of hoodia gordonii for:(a) the entities as defined above,(b) an increase in solute from 0.5g to 1.0 g;(c) an increase in solvent from 20 mL to 40 mL; and (d) an increase in path length from 1 dm to 2 dm. Does entities defined above refer to the picture since its a hoodia gordnii?  I don't even know where to start with this one

Question

7. A 0.5 gram sample of hoodia gordonii isolated from natural sources yields an observed rotation of -0.76° when dissolved in 20 mL of chloroform and placed in a 1-dm cell. Determine the specific rotation [α] of hoodia gordonii for:

(a) the entities as defined above,
(b) an increase in solute from 0.5g to 1.0 g;
(c) an increase in solvent from 20 mL to 40 mL; and (d) an increase in path length from 1 dm to 2 dm.

 

Does entities defined above refer to the picture since its a hoodia gordnii?  I don't even know where to start with this one

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Step 1

(a)

Determine the specific rotation [α] of hoodia gordonii for the given entities:

0.5 g
0.025 g/mL
Concentration
20 mL
a observed rotation
1 cell path length
c concentration of sample
a(in degree)
1(in dm)xc(in g/mL)
Specific rotation, la]
-0.76°
(1 dm) (0.025 g/mL)
a for the given entities = -30.4°
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0.5 g 0.025 g/mL Concentration 20 mL a observed rotation 1 cell path length c concentration of sample a(in degree) 1(in dm)xc(in g/mL) Specific rotation, la] -0.76° (1 dm) (0.025 g/mL) a for the given entities = -30.4°

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Step 2

(b)

Determine the specific rotation [α] of hoodia gordonii for an increase in solute from 0.5g to 1.0 g:

1.0 g
0.05 g/mL
Concentration
20 mL
-0.76°
Specific rotation, [a.] = 1 dm)(0.05 g/mL)
-15.2
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1.0 g 0.05 g/mL Concentration 20 mL -0.76° Specific rotation, [a.] = 1 dm)(0.05 g/mL) -15.2

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Step 3

(c)

Determine the specific rotation [α] of hoodia gordon...

0.5 g
0.0125 g/mL
Concentration
40 mL
-0.76°
Specific rotation, [a.] = 1 dm)(0.0125 g/mL)
-60.80
|
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0.5 g 0.0125 g/mL Concentration 40 mL -0.76° Specific rotation, [a.] = 1 dm)(0.0125 g/mL) -60.80 |

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