Using 18% by weight ammonium hydroxide to make 16ppm aqueous solution

In summary, the conversation discusses the use of the formula M1V1=M2V2 and its application in preparing a solution with a desired concentration of 16 mg of ammonium hydroxide per 1000 ml of solution. The confusion arises due to the 18% by weight concentration of ammonium hydroxide. It is determined that using volumes is not the correct approach and instead, masses should be used. The conversation also mentions the use of the density of pure water and the conversion of mass to volume. Ultimately, the desired finished concentration is 16 mg of ammonium hydroxide per 1000 ml of solution.
  • #1
Frankenstein19
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Thread moved from the technical forums to the schoolwork forums
TL;DR Summary: Used M1V1=M2V2 but am unsure if formula applies

I feel like I could use M1V1=M2V2 but the 18% by weight ammonium hydroxide is confusing me so much.

Density of ammonium hydroxide 18% is 0.926 g/cm3

18%V1=16mg/L*200L

(18mg ammonium/100 mg of total solution) * V1 = 3,200mg ammonium (aq)

(18mg ammonium/100 mg of total solution) * V1 = 3,200mg ammonium (aq)

V1 = 3,200mg ammonium / 18mg ammonium * 100mg of total solution V1 = 17,777 mg of solution × 1g/1000mg × cm3/0.926g

V1 = 1.91 cm3

Is this correct?
 
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  • #2
You even didn't wrote what is the volume you are trying to prepare - is it 200 L?

No, M1V1=M2V2 is not the right approach. You should not operate with volumes, but with masses.

18 ppm is typically w/w - that is, you want your solution to contain 18*10-6 ammonia by mass.

What is mass of the 200 L of the solution? (with no other data I would use just the density of pure water).

18 ppm of that - how many grams of ammonia required?

How many grams of the 18% solution contain required mass of ammonia?

And finally - convert to the volume.
 
  • #3
The desired finished concentration is 16 mg. of ammonium hydroxide per 1000 ml. of solution. Helpful?

Let me jump ahead...
The amount of GRAMS of the base you'd have if you took v ml of the base solution(which is 18%) is ((0.18 grams ammnmhydxd)/(1 gram stock))((0.926 grams stock)/(1 ml. stock))v .Some simplifications and keeping in mind you want to prepare solution resulting in 16 mg. per 1000 ml,

((0.18)(0.926)v)/1000=16
 
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FAQ: Using 18% by weight ammonium hydroxide to make 16ppm aqueous solution

What is the procedure to dilute 18% ammonium hydroxide to a 16 ppm solution?

To prepare a 16 ppm solution from 18% ammonium hydroxide, first calculate the amount of 18% solution needed. Since 18% by weight means 18 grams of NH3 per 100 grams of solution, you need to determine the volume that corresponds to 16 mg/L (ppm) in your final solution. Use the formula C1V1 = C2V2, where C1 is the concentration of the stock solution, V1 is the volume of the stock solution to be used, C2 is the desired concentration, and V2 is the final volume.

How do I calculate the volume of 18% ammonium hydroxide needed for a specific volume of 16 ppm solution?

First, convert 18% by weight to ppm (18% = 180,000 ppm). Then, use the formula (C1V1 = C2V2) to find the volume of the stock solution. For example, to prepare 1 liter of 16 ppm solution: (180,000 ppm) * V1 = (16 ppm) * (1000 mL). Solving for V1 gives V1 = (16 * 1000) / 180,000 = 0.089 mL. Therefore, you need 0.089 mL of 18% ammonium hydroxide diluted to 1 liter with water.

What safety precautions should I take when handling 18% ammonium hydroxide?

When handling 18% ammonium hydroxide, wear appropriate personal protective equipment (PPE) including gloves, goggles, and a lab coat. Work in a well-ventilated area or a fume hood to avoid inhaling fumes. In case of skin or eye contact, rinse immediately with plenty of water and seek medical attention if necessary.

Can I use regular tap water to dilute ammonium hydroxide to make a 16 ppm solution?

For most laboratory applications, it is recommended to use distilled or deionized water to avoid any potential contaminants that might interfere with your solution. Tap water may contain impurities that could affect the accuracy of your final concentration.

What are the common uses of a 16 ppm ammonium hydroxide solution?

A 16 ppm ammonium hydroxide solution can be used in various applications such as chemical analysis, pH adjustment in certain processes, and as a reagent in biological experiments. It is also used in some industrial processes where precise control of ammonia concentration is required.

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