CBSE Class 11-science Answered
324g of 20% by mass of Ba(OH)2 solution
![question image](http://images.topperlearning.com/topper/new-ate/top_mob16353413494840602211e398ed1-1ddd-4c99-9b51-8b8df662880f.jpg)
Asked by arunparewa2000 | 27 Oct, 2021, 18:59: PM
The mass of Ba(OH)2 is 342 g.
The molar mass of Ba(OH)2 is 171 gm
Hence, 1 mole of Ba(OH)2 is the molar mass of Ba(OH)2 is 171 gm
So, for 342 g. wil be x
![straight x equals 342 over 171 equals space 2 space moles](https://images.topperlearning.com/topper/tinymce/cache/cf66ecec1881ed6967bedfc4afe7052a.png)
We know 100% by mass is 2moles hence 20% will be x.
![straight x space equals space fraction numerator 20 cross times 2 over denominator 100 end fraction space 0.4 space moles](https://images.topperlearning.com/topper/tinymce/cache/30e6a5d194b66934ae855a2fadeeb1e7.png)
![The space total space moles space of space Ba left parenthesis OH right parenthesis subscript 2 space equals space 2 space cross times space 0.4 space equals space 0.8](https://images.topperlearning.com/topper/tinymce/cache/ab43ce996ff74480ac138070ac81b091.png)
As given the molarity of HNO3 is 2M, So, the total moles=
![straight M space equals space fraction numerator straight n cross times 1000 over denominator straight V end fraction
straight n space equals space fraction numerator 2 cross times 1200 over denominator 1000 end fraction
straight n space equals space 2.4 space moles](https://images.topperlearning.com/topper/tinymce/cache/fb749f9a9b0bf1109575e4a763270673.png)
Total acidic excess moles = 2.4 - 0.8 = 1.6
The total volume of Ba(OH)2 is ![straight d space equals space straight w over straight v
straight v space equals space fraction numerator 342 over denominator 0.57 end fraction space equals space 600 ml](https://images.topperlearning.com/topper/tinymce/cache/69f53de863f4ff99d5c4e70a91106383.png)
![straight d space equals space straight w over straight v
straight v space equals space fraction numerator 342 over denominator 0.57 end fraction space equals space 600 ml](https://images.topperlearning.com/topper/tinymce/cache/69f53de863f4ff99d5c4e70a91106383.png)
The volume of HNO3 is 1200ml
Hence the total volume of Ba(OH)2 = 1200+600 =1800 ml
![straight M space equals fraction numerator straight n cross times 1000 over denominator straight V end fraction
straight M space equals space fraction numerator 1.6 cross times 1000 over denominator 1800 end fraction
straight M space equals space 0.88 straight M](https://images.topperlearning.com/topper/tinymce/cache/1468be51f7c4ce15480ff98eb4adb115.png)
Answered by Ramandeep | 28 Oct, 2021, 14:50: PM
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