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number 65 the ph of a 0.23 molarity solution of hf is 1.92 determine the ka for hf from these data okie dokie so two things that they gave us here they said that the ph of hf is 1.92 so im just going to write that down here so we have a ph equal to 1.92 and they told us that we had a 0.23 molarity solution of hf so maybe ill just write hf equals 0.23 molarity cool and they want us to find the ka value now remember a ka the ionization constant for an acid always comes from a balanced equation it comes from the ionization of your acid in this case hf is an acid theyre saying that its an acid because k a a for acid so im going to just write a quick equation just to say what hf is doing and hf and any acid all you have to do is just get rid of the one hydrogen from the rest of the compound so in this case im going to say this is at equilibrium hf is classified as a weak acid it is not one of your six strong and this will break down into h plus plus f minus youre just separating out