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WebEthanoic acid is a weak acid that ionises as follows: CH3COOH (aq) ⇌ H+ (aq) + CH3COO- (aq) Step 1: Write down the equilibrium expression to find Ka Step 2: Rearrange the equation to find [H +] Step 3: Substitute the values into the expression = 1.02 x 10-5 mol dm-3 Step 4: Calculate the pH pH = - log [H+] = -log 1.02 x 10-5 = 4.99 Uses of Buffers WebOCR (A) Chemistry Easter Crash Course 11th – 14th April A Level 9:30am – 4:30pm £345 Our intensive four-day crash courses take revision up a notch, setting Year 13 students on the path to success. Book Now Online AQA … pagina 78 de matematicas
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