Chemistry

Chemistry, 10.11.2019 09:31, pandaman632

What is hard water and how does it form?

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Chemistry, 25.06.2019 08:30, ernest214

One of the main components of hard water is caco3. when hard water evaporates, some of the caco3 is left behind as a white mineral deposit. plumbing fixtures in homes with hard water often acquire these deposits over time. toilets, for example, may develop these deposits at the water line as the water in the toilet slowly evaporates away. if water is saturated with caco3, how much of it has to evaporate to deposit 0.390 g of caco3? ksp for caco3 = 4.96 x 10-9.

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Chemistry, 24.07.2019 11:30, tejasheree

Since soap and detergent action is hindered by hard water, laundry formulations usually include water softeners—called builders—designed to remove hard water ions (especially ca2 + and mg2 + ) from the water. a common builder used in north america is sodium carbonate. suppose that the hard water used to do laundry contains 75 ppm caco3 and 55 ppm mgco3 (by mass). what mass of na2co3 is required to remove 90.0% of these ions from 10.0 l of laundry water?

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English, 30.07.2019 21:00, mochoa4

Formula verb form i don't think you should work so hard. use 'i don't think you should' the base form of the verb in a statement. you ought to work less. use 'you ought to' the base form of the verb in a statement. you ought not to work so hard. use 'you ought not to' the base form of the verb in a statement. if i were you, if i were in your position, if i were in your shoes, i wouldn't work so hard. use 'if i were' 'you' or 'in your position' or 'your shoes' 'i wouldn't' or 'i would' base form of the verb in a statement (a form of the conditional 2). you had better work less. use 'you had better' (you'd better) the base form of the verb in a statement. you shouldn't or you should work less. use 'you should' or 'you shouldn't' the base form of the verb in a statement. whatever you do,don't work so hard. use 'whatever you do' the imperative. write a dialogue between two high school students who are friends. one of them is talking about dropping out out of school to get a job and the other one gives advice without being asked. use phrases from the article.

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Biology, 01.10.2019 21:30, crybaby222psyc

Match the description to the form of water that is described. most dense form of water water vapor bonds hold water molecules far apart from each other liquid water least dense form of water ice

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