Consider a buffer composed of the weak acid ha and its conjugate base a−. part a which pair of concentrations results in the most effective buffer? which pair of concentrations results in the most effective buffer? 0.90 m ha; 0.10 m a− 0.50 m ha; 0.50 m a− 0.10 m ha; 0.90 m a− 0.10 m ha; 0.10 m a−

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.