How many ml of 1:750 benzalkonium solution are needed to prepare 500ml of a 1:10

Question

How many ml of 1:750 benzalkonium solution are needed to prepare 500ml of a 1:1000 benzalkonium solution?

2. How many mL of a 1:750 benzalkonium solution are needed to prepare 500mL of a 1:1000 benzalkonium solution? 3. How many mL of a 6% acetic acid solution are needed to prepare 350ml. of a 2.5% acetic acid solution? 4. How many mL of a 1:2 magnesium sulfate solution are needed to prepare 50 mL of a 15% magnesium sulfate solution? 5. How many mL of a 23.5% sodium chloride (NaCI) solution are needed to prepare 1000 mL of a 0.9% NaCl solution. 6. a 125 formaldehyde solution? solution are needed to prepare 240 mL of many mi of a 40% 1. De Jansen ord 50ml 5% magnesium sulfate solution to be added to 20oml ers is the final concentratian?

Explanation / Answer

C1 = 1/750

V1 = ?

C2 = 1/1000

V2 = 500 mL

We know that

C1V1 = C2V2

(1/750) V1 = (1/1000) x 500 mL

V1 = 375 mL

Therefore,

375 ml of 1:750 benzalkonium solution are needed to prepare 500ml of a 1:1000 benzalkonium solution.

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