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A 5.00 mL sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrocholoric acid. the five mL sample requires 18.02 M HCL solution to reach the endpoint. What is the concentration of the Ba(OH)2 solution?Ba(OH)2 (aq) + 2 HCL (aq) ----> BaCl2 (aq) + 2H2O (l)
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.088 M in NH4Cl
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi. The elastic moduli of the concrete and steel are, respectively,
Calculate the mass percent composition of carbon in each the following carbon compounds. C4H10 C6H10 C8H13O5N
How much heat is required to warm 223 g of ice from -45.3°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
how many grams of sodium lactate nac3h5o3 should be added to 1.00 l of 0.260 m lactic acid hc3h5o3 to form a buffer
Several oxidation reductions take place. List three examples of oxidation reduction reactions that are involved. Show what is oxidized what is reduced, and indicate which enzyme (E1, E2, E3) is involved.
What partial pressure of oxygen is a scuba diver breathing if the total pressure is 6.3 atm and 20 percent of the air is oxygen
A scientist has a sample of gas that was collected several days earlier. The sample has a volume of 392 cm3 at a pressure of 0.987 atm and a temperature of 21°C.
What volume (in mL) of a 1.420M NaOH solution is required to titrate 25.0mL of 4.50M HCl solution.
A sample of nitrogen N2 has a volume of 300 mL at 34^C and a pressure of 745 mmHg. What is the Volume of Nitrogen at STP
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 if you accidentally added 5 drops of disodium hydrogen phosphate
What characteristic properties distinguish the transition elements from the Group IA and -IIA metals?
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