A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?

Answer 1

7.5 oz

Using the standard dilution equation:

#c_1 * v_1 = c_2 * v_2#
Where: #c_1# = concentration 1 = 10% #v_1# = volume 1 = 30 oz #c_2# = concentration 2 = 8% #v_2# = volume 2 = ???
Rearranging for #v_2# we get:
#v_2 = (c_1 * v_1) / c_2#
#v_2 = (10 * 30) / 8#
#v_2 = (300) / 8#
#v_2 = (300) / 8#
#v_2 = 37.5# oz

We already have 30 oz, so just need to add 7.5 oz.

I have a free ebook that covers moles and molarity, percentage solutions, and dilutions, which you may find useful.

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Answer 2

The nurse needs to add 3 ounces of water to the 30 ounces of 10% benzalkonium chloride solution in order to dilute it to an 8% solution.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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