Most people find waterbeds uncomfortable unless the water temperature is maintained at about 85 °f. unless it is heated, a waterbed that contains 892 l of water cools from 85 °f to 72 °f in 24 hours. estimate the amount of electrical energy required over 24 hours, in kwh, to keep the bed from cooling. note that 1 kilowatt-hour (kwh) = 3.6 × 106 j, and assume that the density of water is 1.0 g/ml (independent of temperature). what other assumptions did you make? how did they affect your calculated result (i. e., were they likely to yield "positive" or "negative" errors)?

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.