To Measure Calcium in a Breakfast Cereal,0

question 17

Short Answer

To measure calcium in a breakfast cereal,0.6590 grams of crushed cereal were reacted for 1 hour in warm 1 M HNO₃.The reaction mixture was filtered and the filtrate transferred to a 100 mL volumetric flask.A series of eight standards are prepared by transferring 5.00 mL aliquots to 50-mL volumetric flasks to which increasing volumes of standard Ca²⁺ (containing 20.0 g/mL)is added,diluting to the final volume with distilled deionized H₂O.The samples were then analyzed by flame atomic absorption.Use the data and graph below to find the percent by mass calcium in the cereal.

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