题目内容
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The concentration of carbon dioxide is caused by_______.
A．the heat accumulated in the atmosphere
B．the burning of coal
C．the wide use of renewable energy
D．the destruction of the tropical rain forest
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Ca ion-selective electrode and a one-point standard addition. A 10. 00 mL. sample is trans-erred to a 100 mL volumetric flask and diluted to volume. A 50. 00 mL aliquot of sample is placed in a beaker with the Ca ion-selective electrode and a reference electrode,and the potential is measured a s-0.052 90 V. A 1, 00 mL aliquot of a 5. 00X10-2mol·L-1standard solution of Ca2+is added,and a potential of -0.044 17V is measured. What is the concentration of Ca in the sample of sea water?
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