150 ml of 050 m hcl is added to a 100-ml sample of 0496 m
15.0 mL of 0.50 M HCl is added to a 100.-mL sample of 0.496 M HNO2 (Ka for HNO2 = 4.0 × 10-4). What is the equilibrium concentration of NO2- ions?
A. 2.6 × 10-3 MB. 1.7 × 10-4 MC. 4.3 × 10-1 MD. 5.1 × 10-2 ME. none of these
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