Suppose you nad to make a buffer to keep a solution at a pH of about 4. You have several Combinations of weak acids of bases Heat you Could use to make this buffer.: their conjugate 1 Nitrous Auid ( La=7.2xy0)4sodium nitrite 2.) Phosphoric acid (Ka=71409)4 sodium di hydrogen phospate (Ka-6.6*1)sdium fluoride 3.) Hy drofleuoric acid 4.) Benzoic acid (Kas6.3410-5)4sodiume benzoàte 5) Ethanoic acidKa=1,8«11)+ adim ethancete which of the combos uould be suitable for making the haffer? Circle all coabos above that could be used to make buffer to maintain a pt of 4. 6.) which tomb0 mainta ining ould be most effective for g a pH of 4? Write the number to that combo below. cor

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.