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Explain which one of the subsequent conditions is always true for a titration of a weak acid with a strong base?
a. A colored indicator with apKa less than 7 should be used.
b. If a colored indicator is used, it must change color rapidly in the weak acid's buffer region.
c. Equal volumes of weak acid and strong base are required to reach the equivalence point.
d. The equivalence point occurs at a pH equal to7.
e. The equivalence point occurs at a pH greater than 7.
Explanation for the Chemical Structure of Hydrocortisone, Can you please explain the chemical structure of cortisol and hydrocortisone? What is the difference on the structure? How many functional groups hydrocortisone has and what are they?
If a salty crude sample was analyzed to have 110.6 ppm salt, calculate the pounds of salt per 1000 bbls of crude
A sample of zinc nitride, Zn3N2, contains 39.0 g of zinc. How many nitride ions are present
Draw the organic product of the following reaction between (1S,3S)-1-chloro-3-methylcyclopentane and methanethiol in the presence of sodium hydroxide.
a mixture of caco3 and cao weighing 0.711 g was heated to produce gaseous co2. after heating the remaining solid
The rate constant for a certain reaction is = 6.10×10?3 . If the initial reactant concentration was 0.750 , what will the concentration be after 18.0 minutes
Assuming the specific heat os the solution is 4.18 (J/gC), that its density is 1 g/ml, and that the calorimeter itself absorbs a negligibkle ammount of heat, calculate delta H in kJ for the rxn
A compressed gas cylinder contains 1.00 x 103 g of argon gas. The pressure inside the cylinder is 2050 psi at a temperature of 18oC. How much gas remains in the cylinder if the pressure is decreased to 650psi at a temperature of 26oC?
A metal sample weighing 34.526 g was heated to 98.0 C then quickly transferred into Styrofoam cup calorimeter containing 74.365 g of distilled water at a temperature of 27 C. The temperature of the water in the cup increased and stabilized at 29 C..
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241
A compound A (C6H6) undergoes catalytic hydrogenation over Lindlar catalyst to give a compound B, which in turn undergoes ozonolysis followed by workup with aqueous H2O2 to yield succinic acid and two equivalents of formic acid.
What is the cell potential for the following standard cell Cr(s) / Cr(NO3)3 // SnCl2, SnCl4 / Pt(s) b) Do you expect this cell to have a - or + ?Go
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