2. Una solución acuosa de amoníaco \( \mathrm{NH}_{3} 0,25 \mathrm{M} \) tiene un Kb de \( 1,8 \times 10^{-5} \), presenta disuelta una sal de cloruro de amonio \( \mathrm{NH}_{4} \mathrm{Cl} \) en una concentración de \( 0,45 \mathrm{M} \). a. Calcule el pH teniendo en cuenta ambas sustancias disueltas. b. Calcule el pH suponiendo que solo está presente el amoníaco. c. Escriba una conclusión teniendo en cuenta los resultados de los incisos a y b.

Which of the following molecule(s) have lone pair electrons and/or non-identical central bonds? NH3 BF3 PF5 PF3

There are different types of food coloring available in most grocery stores- one that is water-based, and one that is oil-based. The oil-based food coloring works best in chocolates, in fry-oil to color fried foods, and in food with high butter contents. Based off of this information and knowing that substances of like polarity mix readily with one another, which food coloring is more polar (water-based or oil-based)? Which food coloring is less polar (or even nonpolar)? Water-based [Choose ]

Which of the following molecule(s) have lone pair electrons and/or non-identical central bonds? \( \mathrm{CCl}_{4} \) \( \mathrm{CHCl}_{3} \) \( \mathrm{SO}_{3} \) \( \mathrm{CO}_{2} \mathrm{O} \)

Please select the molecule(s) with double bond(s) from the following. \( \mathrm{CCl}^{2} \) CHCl 3 CO 3 H 2 O None

Please select polar molecule(s) from the following. NH3 BF3 PF5 PF3