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The observed rotation of 10ml of a solut...

The observed rotation of 10ml of a solution containing 2g of a compound when placed in 25cm long polarimeter tube is +`13.4^@`. What is the specific rotation of the compound?

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`alpha_(obs) = +13.4^@`
`C = (2g)/(10 cm^3) = 0.2 g cm^(-3)`
`l = (25)/10 dm = 2.5 dm`
Specific rotation , `alpha = (+13.4)/(0.2 xx 2.5) = +26.8^@`.
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