A. Calculate the pH of a buffer made from 0.28 M HNO2 and 0.23
M NO2-. The ka for HNO2 is 4.6 x 10-4.
B. What is the pH of the solution containing 0.20 M NH3 and 0.15
M NHACI?
A. Calculate the pH of a buffer made from 0.28 M HNO2 and 0.23
M NO2-. The ka for HNO2 is 4.6 x 10-4.
Calculate the pressure, in atm, required to compress a sample of helium gas from 5.00 L
(at 1.00 atm) to 2.00 L.
The concentration of ethanoic acid in vinegar was measured as follows: A 50 cm3 sample of vinegar was diluted to 500 cm3 using deionised water. The diluted solution was titrated against 25 cm3 portions of a standard 0.12 M sodium hydroxide solution, using a suitable indicator. Titration reaction: CH3COOH(aq) + NaOH(aq) → CH3COONa(aq) + H2O(aq) After carrying out a number of accurate titrations of the diluted solution of ethanoic acid, the mean titration figure was found to be 20.5 cm3 . a) Calculate the concentration of ethanoic acid in the diluted vinegar solution in moles per liter.
If I have an unknown quantity of gas at a pressure of 1.8 atm, a volume of 110 liters, and a temperature of 87 C, how many moles of gas do I have?
1. How many formula units of sodium nitrate will react with 20.0 g of calcium carbonate to product sodium carbonate and calcium nitrate according to the following reaction?
2 Na(NO3) + Ca(CO3) à Na2(CO3) + Ca(NO3)2
how many miles of tin (II) fluoride is there in 908 grams of tin (II) flouride
what is the mass of chlorine molecules (Cl2) that contains twice as many molecules as found in 3.6g of water?
a gas jar contains 240cm3 of carbon dioxide gas. calculate :
a) number of moles of carbon dioxide gas
b) number of molecules of carbon dioxide gas
c) mass of carbon dioxide gas
calculate the number of atoms in the following substances.
i) 13 g of zinc, Zn
ii) 5.6 g of nitrogen gas, N2
iii) 8.5g or ammonia gas, NH3
iv) 14.2 g of chlorine gas,Cl2