Answer:
Distillation is an important commercial process that is used in the purification of a large variety of materials. However, before we begin a discussion of distillation, it would probably be beneficial to define the terms that describe the process and related properties. ... Elevation of the boiling point with an increase in external pressure, while important in cooking and sterilizing food or utensils, is less important in distillation.
Explanation:
Answer: D or B but i think D because iron will react slower with tap water than Hydrochloric acid
your answer is <u>D</u><u>.</u><u> </u>physical change, because a new substance is not formed.
The solution to the problem is as follows:
This is mostly stoichiometry with a little bit of substitution into the acid dissociation equation.
You need intial moles of acid and salt = 0.025 x 0.16 = 0.004 mol
You need moles HA after 8ml of 0.21 M KOH added = 0.004 - (0.008 x 0.21) = 0.00232 mol HA
moles of salt = moles of acid reacted = (0.008 x 0.21) = 0.00168 mol A-
Now work out concentrations based on total volume = 0.025 + 0.008 = 0.033 dm3
[HA] = 0.00232/0.033 = 0.0703 M
[A-] = 0.00168/0.033 = 0.0509 M
ka = [H+][A-]/[HA]
1.74 x 10-5 = [H+] * 0.0509/0.0703
[H+] = 2.4 x 10-5
pH = 4.62
<span>For the 40 ml addition there is no acid left over, so it's just calculated from excess base.
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Answer:
Milk, cream, milk solids, sugars, modifying agents and flavourings are blended together in stainless steel vats.
The mix is homogenised to create a consistent texture.
The mix is pasteurised by heating at 82-85°C for 15 seconds then cooled to destroy bacteria.
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