# CHEM

am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentration between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH based on the concentrations using the Henderson-Hasselbalch equation. We have not gone over this in class so I'm on my own and lost. Can anyone help?? With NH4Cl being a solid I have to calculate how many grams of the solid to dissolve into 100 mL of the solution. I also know that the Ka value of NH4 is 5.6 x 10 to the -10power.

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1. What's wrong with what I gave you last night? The directions are there; I made 1 L of solution so adjust to 100 mL for this and you have it. I'll be glad to help you through it but I don't want to do the work for you.

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posted by DrBob222

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