Consider the following acid and bases HCO2H ka = 1.8 x 10^-4 HOBr Ka = 2.0 x 10^-9
(C2H5)2NH kb = 1.3 x 10-3
HONH2 kb = 1.1 x 10^-8
choose sobstances to create ph = 4 buffer solutions:
select all tha apply
HONH3NO3
HOBr
NaOBr
(C2H5)2NH2Cl
(C2H5)2NH
HCO2H
KHCO2
HONH2

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit

The lattice enthalpy (formation of ionic solid from ions in the gas phase) for agcl(s) is -916 kj/mol and the hydration enthalpy (dissolution of gaseous ions into water) is -850 kj/mol. how much heat (in joules) is involved in forming 1l of saturated agcl solution (1.8 × 10-4 g / 100 ml water) by dissolving agcl(s)? assume solution volume does not change much upon dissolution. the equations are given below. ag+(g) + cl−(g) æ agcl(s)

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!