Tuesday
December 10, 2013

Posts by Tricia

Total # Posts: 62

Chemistry help needed
Thank you for your explanation.Is there any formula that we can apply universally for preparations of this nature(w/w)?

Chemistry help needed
How do I prepare 90% formic acid from conc. formic acid (98%-100% of density 1.22g/ml)? Please help me check if my calculations are correct. Assuming conc. formic acid is 99%, 0.99 X 1.22 = 1.2078 Add 1.2078 / 9 = 0.1342ml H2O to 1ml of conc. acid to have a solution that is 90...

Chemistry pls help
I have a chemistry question Please advise how do I prepare 1L of 75% H2SO4 from concentrated H2SO4 (98% of density 1.84g/ml)? Do you have an equation which i can use? Someone gave me the following equation but I do not understand it. Vx1.84x0.98={(1000-V)+ 1.84V}0.75 where V= ...

Science, Chemistry
I would like to know how to derive it, please?

Science, Chemistry
I have been told that to prepare 1L of 70% H2SO4 from concentrated sulphuric acid (96% with density 1.84g/ml), I should use the following equation to find out the volume of conc. acid needed (Vml). V x 1.84 x 0.96={(1000-V)+ 1.84V}0.7 i.e. V= 594ml of conc H2SO4. Use 594ml of ...

Science
How do I prepare 1% H2SO4 from concentrated sulphuric acid (96% with density 1.84g/ml)? Thank you very much for your help.

critical thinking
Thank you for your help.

critical thinking
I guess my answer would be "B". Am I right? Thanks

critical thinking
the number of black owners increased during the 1830-1860 period

critical thinking
property owned by black residents in Washington D.C 1830-1860 property value(dollars)-no. of owners 1830 1840 1850 1860 1-200 26 30 21 8 200-400 20 35 58 51 400-600 13 26 32 69 600-800 7 16 20 61 800-1000 2 5 11 48 1000-1500 2 8 19 69 1500-2000 1 1 1 21 2000-2500 1 2 4 20 2500...

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