This type of problem is going to be on my test in a few days and I have no idea

Question

This type of problem is going to be on my test in a few days and I have no idea how to answer it. I put a few of them below, but if they are worked the same I just need one explanation on how to do it. Thanks in advance! 1. If equal volumes of 0.20 NaOH and 0.10 NaH2PO4 are mixed what type of system is formed? A) amphiprotic B) buffer Ka3 C) strong base D) weak base 2. If equal volumes of 0.15 HCl and 0.10 Na2HPO4 are mixed what type of system is formed? A) buffer Ka2 B) Buffer Ka1 C) strong acid D) amphiprotic 3. If equal volumes of 0.15 NaOH and 0.10 NaH2PO4 are mixed what type of system is formed? A) Buffer Ka2 B) amphiprotic C) Buffer Ka3 D) strong base 4. Sort the following solutions into the appropriate category (Strong Acid, Strong Base, Neutral, Weak Acid, Weak Base, Ka1 buffer, Ka2 buffer, Ka3 buffer, or amphiprotic). A. 0.1 M Lithium Hydroxide and 0.2 M Hydrochloric Acid. B. 0.1 M Nitrous Acid and 0.05 M Potassium Hydroxide C. 0.2 M Formic Acid and 0.2 M Sodium Hydroxide D. 0.25 M Monosodium Phosphate and 0.25 M Hydroiodic Acid E. 0.2 M Sodium Carbonate and 0.1 M Hydrochloric Acid Any help or rules to follow would be greatly appreciated.

Explanation / Answer

1)Buffer

Monosodium phosphate(NaH2PO4), also known as anhydrous monobasic sodium phosphate and sodium dihydrogen phosphate, is achemical compoundofsodiumwith aphosphatecounterion. It is used as alaxativeand, in combination with othersodium phosphates, as apH buffer.

ThepKais 6.8-7.2 (depending on the physicochemical characteristics during pKa determination).[1]Thesodium chlorideequivalent value, or E-Value, is 0.49. It is soluble in 4.5 parts water. It is most commonly available as colorless crystals or a white powder. It is insoluble in alcohol. It is also formed when a sodium halide compound reacts withphosphoric acid.

2)strong acid

3)Buffer

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