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# chemistry help watch

1. if 1l of agno3 has been prepared by adding 900ml of water to 100ml of 0.2m agno3 what is the molarity of the solution
mr of agno3 is 170

stuck on this q any help appreciated
2. 0.02m
3. (Original post by Maker)
0.02m
how did u work this out?
4. You sure the question isn't asking for the new concentration??
5. (Original post by Master2472)
how did u work this out?
You divide the molarity of the original solution by 10.
6. (Original post by LilN)
You sure the question isn't asking for the new concentration??
7. (Original post by LilN)
You sure the question isn't asking for the new concentration??
never mind I figured it out its simply just using c1v1=c2v2 lol
8. (Original post by Master2472)
So it's asking for the new concentration in mol per litre. You don't really need to do any working out. If you think about it, you're adding 900ml of water to 100ml of 0.2 mol AgNO3. Regardless of how much water you add you're still going to have 0.2 mol of AgNO3. The only thing that will change when you add more or less water is the concentration. You have 0.2 mol of AgNO3 and now 1000ml of water (1litre). So that's 0.2 mol for every litre of water. So 0.2mol/litre.
9. (Original post by Master2472)
never mind I figured it out its simply just using c1v1=c2v2 lol
Haha fairs

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