Nitrous acid, HNO2, is a weak Bronsted-Lowry acid with a pk, value of 3.34 at room temperature. HNO, can be prepared by reacting N20z with water. HNO, is the only product. Achemist makes up a buffer solution by the following method. Step 1 the chemist weighs a sample ofN,Oz. Water si then added ot form 10 cm? of 0.500 moldm-3 HNO,(aq). Step 2 The chemist adds 100 cm3 of 0.150 moldm-3 NaOH(aq) to the 100 cm° solution of 0.500 mol dm 3 solution of HNO2(aq). The resulting solution is made up to 1.00 dm°. Explain why a buffer solution forms in Step 2. Determine the pH of this buffer solution and the mass of N20that was used in Step .1