A 50.00 g sample of an unknown metal is heated at 45.00°C. It is then placed in a coffee-cup calorimeter filled with water. The calorimeter and the water have combined mass of 250.0•°g an and overall specific heat of 1.035 cal/g•°C. The initial temperature of calorimeter is 10.00°C. The system reaches a final temperature of 11.08°C when the metal is added.

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Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m