A 0.14 M HNO2 solution is 5.7% ionized. Calculate the H+ ion concentration Solut

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Explanation / Answer

5.7% ionization means that for every 100 moles of the acid 5.7 moles are ionized. The ionization equation is: HNO2 =======> NO2(-) + H(+) Take for example 1 L of solution, because the molarity is 0.14 then we have 0.14 moles of HNO2 of which 5.7% ionize, this is: 0.14 x 5.7/100 = 0.00798 moles of HNO2 that are ionized. Because the reaction above tells you that for 1 mol of HNO2 that ionizes you get 1 mol of NO2(-) and 1mol of H(+) then we can say that 0.00798 moles of HNO2 will give you 0.00798 moles of H(+). Remember that we took 1L of solution thus the molarity of H(+) is also 0.00798 M or with two sig. figures we get:

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