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13 September, 09:03

Suppose that a 0.2 g/mL solution of (S) - ibuprofen in a 2 dm long cell rotates plane-polarized light + 10°. What is the specific rotation for (S) - ibuprofen?

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  1. 13 September, 09:28
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    +25°

    Explanation:

    The formula for calculatin the specific rotation, α, is:

    α=αobs: (c*l)

    αobs being the rotation observed

    c is being the concetration (g/mL)

    l being the path length (dm)

    So it ends up being:

    α=+10° / (0.2 g/mL*2 dm) = + 10°*ml/0,4g*dm

    α=25°
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