What is the hydronium-ion of a 0.130 M oxalic acid, H_2 C_2 O_2 solution? For ox

Question

What is the hydronium-ion of a 0.130 M oxalic acid, H_2 C_2 O_2 solution? For oxalic acid, K_et = 5.6 times 10^-2 and K = 5.1 times 10^-2 A) 6.2 times 10^-2 M B) 2.5 times 10^-3 M C) 8.5 times 10^-2 M D) 2.6 times 10^-3 M E) 1.0 times 10^-2 M Which of the following combinations is not suitable for making a buffer? A) H_3 PO_4. and NaH_2 PO_4 B) NaCO_3 and NaHCO_2 C) NH_4 CL and NH_3 D) NaH_2 PO_4 and NaHPO_4 E) HCIO_4 and NaClO_4 What is the solubility (in g/L) of barium sulfate at 25^degree C? The solubility product solubility constant for barium sulfate is 1.1 times 10 at 25^degree A) 1.3 times 10^-4 g/L B) 2.6 times 10^-8 g/L C) 0.0024 g/L D) 0.070 g/L E) 0.38 g/L

Explanation / Answer

Solution: 7 Ans. E

Buffer is solution of an weak acid and its salt always,

E) HClO4 and NaClO4

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