Question

As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips, boil them in water to extract the salt, and then filter the boiled chips to remove the soggy chip pieces. You then analyze the chip filtrate for Cl− concentration using the Mohr method. First you prepare a solution of silver nitrate, AgNO3, and titrate it against 0.500 g of KCl using the Mohr method. You find that it takes 62.8 mL of AgNO3 titrant to reach the equivalence point of the reaction.You then use the same silver nitrate solution to analyze the chip filtrate in a Mohr reaction, finding that the solution yields a rusty brown precipitate when 48.8 mL of titrant is added. Part 1: If the sample of chips used to make the filtrate weighed 87.5 g , how much NaCl is present in one serving (145 g ) of chips?

Answer 1

Mohr - mehed t Astcom) turcace Again is Here when and the all houm indicator used cs reached, post ved brown precipitare potassium Chromote. reacts with count? Zagt tcro 2 Alcra. Arst standardization Agno, moles of of Agro solutiont. Rocl → Agc) tk nog Agno added a moles ofici mules kc a mass molar mass 0 Joog 74-55139 (mol 2) my vagno 2 0.0067068 moles m x 62-8mL x 103 a 0.0067068 moles 2) mono ? 0-1068 m. Aynes 10-107m of Nach second t moles of ct a moles of Agno added 2 0.10tmx 48-8ml x 16 = moles of Nad 2 0.00 522 moles mass of wall 20 .00522 maesx molar mass 20.oor22 moles x58.44g 2 o 3050 In 875 samples of chips - 03059 Nad present en 1959 chips a well present. Amount of wall present a 1459 x 0.3059 8259 2 0-5059 (present in one sening)