Formaldehyde with Rose 37% & 4% Compound Question

by Alexander
(Minneapolis, MN, USA)

Formaldehyde with Rose Percentage Compound Question

Formaldehyde with Rose Percentage Compound Question

A prescription for 120 XML of. formaldehyde 8% with rose. The pharmacy has formaldehyde 37% and formaldehyde 4% with rose. How much of each ingredient is needed to make this compound?

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Alligation
by: Anonymous

Use Alligation:

so, 37 | | 8 - 4 = 4mL parts of 37%
| 8 |
4 | | 37 - 8= 29mL parts of 4%
-------------------
33 parts of 8%
x mL of 37% 4 mL of 37%
____________ = _____________
120 mL 33 mL of 8%

x= 14.51 mL of 37%

x mL of 4% 29 mL of 4%
____________ = ____________
120 mL 33 mL of 8%

x= 105.45 mL of 4%

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