The Magnesium in a Sample of Mineral Water Weighing 110

question 142

Multiple Choice

The magnesium in a sample of mineral water weighing 110.520 g is first converted to MgNH₄PO₄ and then to Mg₂P₂O₇.The mass of Mg₂P₂O₇ obtained is 0.0216 g.Express the quantity of magnesium in the mineral water in parts per million (that is in g Mg per 10⁶ g H₂O) .

• A)1.95 × 10³ ppm
• B)8.95 ppm
• C)234 ppm
• D)42.7 ppm
• E)21.4 ppm

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Definitions:

Design Specifications

Detailed descriptions of the requirements for a product, including dimensions, materials, and performance criteria.

Variability

Any deviation from the optimum process that delivers perfect product on time, every time.

X-bar Chart

A control chart used in statistical process control to monitor the process mean over time and identify any variations from the normal process performance.

Uniformity

The consistency and evenness of something, such as product quality, across different units or batches.