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Explain why, during the recrystallization of p-dibromobenzene, the turbity of the hot solution was used as an indicator for the ratio of ethanol to water used.
Why can we use a water-ethanol mixture but not a water-hexane mixture as recrystallizing solvent?
a 93.7 g 5.20 mole sample of water is heated to exactly 94.4 celsius. it is then added to 90.1 g 5.00 mole of water at
how does the ability of permanganate (VII) ( when being reduce to Mn2+) to oxidize aqueous chloride , bromide or iodide ions change?
what the volume of 0.109m HNO3 that is required to reat completely with 2.5g Barium hydroxide
Picric acid is a monoprotic acid that has been used in the leather industry and in etching copper. However, its' laboratory use has been restricted because it dehydrates on standing and can become shock sensitive
Tartaric acid is composed of carbon, hydrogen and oxygen. A sample weighing 0.400g is subjected to combustion analysis and produced 0.469g carbon dioxide and 0.144g water. Find the empirical formula of tartaric acid.
What is the pH of a solution containing 50.00 mL of 1.0 M HCl and 50.00 mL of 1.0 NH3? The Kb for NH3 = 1.8 x 10-5.
If you know the answer please give units :) Part A: The reactant concentration in a zero-order reaction was 5.00×10^?2M after 140s and 3.00×10^?2M after 300s. What is the rate constant for this reaction? -> For this I got that 1.25x10^-4M/s, whic..
An analyst collects and melts 555.0 g of snow. a 100 g portion of the resulting water is made basic with ammonia, treated with cyanide and to mask other metal ions, and then extracted with 10.0 mL of a solution of dithizone in chloroform. the chlo..
What pH would you make the water layer in order to cause the acid to dissolve in the ether layer and the amine to dissolve in the water layer? d. How would you purify a mixture of benzoic acid, chlorobenzene, and cyclohexylamine?
Which two starting materials are needed to prepare the following compound
how much heat is released at constant pressure when 50.0 g of nis reacts with excess o2 according to the reaction
The temperature after the reaction is 25.23 C. If the density of final solution is 1.02 g/mL, calculate q, if the specific heat of the solution can be assumed to be equivalent to that of water.
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