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| 1. |
What will be the molarity of solution which contain 5.85gms of NaCl per 500 ml |
| Answer» The\xa0molarity\xa0is calculating the moles of solute\xa0per\xa0volume of\xa0solution\xa0that is taken in litre. It\xa0has\xa0to analyse with moles of\xa0NaCl\xa0is equal to 5.85/58.5=0.1.Molarity varies with temperature and so we have to specify this for the answer to be accurate. Let’s go with 20˚C. Also molarity is specified per litre of the solution and so we’ll need to work out the solution volume at 20˚C.Now the atomic masses of Sodium and Chlorine are 22.99 and 35.45 respectively, so the molecular mass of NaCl is 58.44g. With 5.85g of NaCl we therefore have:5.8558.44=0.1001\xa0mol5.8558.44=0.1001\xa0molMeanwhile 200ml of water has a mass of 200g and so the mass of the solution is 5.85+200=205.85g.\xa0 | |