Arsenic Acid (H3AsO4) is a triprotic acid with Ka1 = 5.5x10^-3 Ka2 = 1.7x10^-7 and Ka3 =5.1x10^-12. calculate [H+], [OH-], [H3AsO4], [H2AsO4^-], [HsO4^2-] and [AsO4^3-] in a .20M arsenic solution

Which of these statements properly demonstrates the angle addition postulate for the m∠afc m∠afc ? a. m∠afc=m∠afb+m∠bfd m∠afc=m∠afb+m∠bfd b. m∠afc=m∠afb+m∠bfc m∠afc=m∠afb+m∠bfc c. m∠afc=m∠cfd+m∠dfe m∠afc=m∠cfd+m∠dfe d. m∠afc=m∠afb+m∠dfc+m∠cfb m∠afc=m∠afb+m∠dfc+m∠cfb

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

General ways to reduce the risk of some action include