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Ad libitum [116K]
3 years ago
11

An unknown solution has a pH of 8. How would you classify this solution?

Physics
1 answer:
slava [35]3 years ago
7 0
B) the substance is a base
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A water heater warms 35 l of water from a temperature of 22.7 c to a temperature of 83.7
fgiga [73]
The amount of energy needed to increase the temperature of a substance by \Delta T is given by
Q=m C_s \Delta T
where
m is the mass of the substance
C_s is its specific heat capacity
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The water volume is V=35 L= 35 dm^3 = 0.035 m^3, since its density is d=1000 kg/m^3, the mass of this sample of water is
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Q=mC_s \Delta T=(35 kg)(4.18 kJ/kg ^{\circ}C)(61^{\circ}C)=8924 kJ = 8.92 \cdot 10^6 J
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