7. One of the methods for monitoring the completion of the electrolytic silvering process is to connect a copper coulometer, the cathode of which is hung on the balance beam of a pan scale, in series with the electrolysis circuit. After achieving the calculated weight gain, the copper cathode of the coulometer is lowered, breaking the electric circuit of the silvering bath. Calculate the required weight gain of the copper coulometer cathode during the silvering period if the silvering bath, installed in series with the coulometer, contains parts with a total surface area of ​​21.6 dm2, which must be coated with a silver layer 30 μm thick. What is the duration of the silvering process at a cathode current density of ik = 0.20 A / dm2 and a current efficiency of about 100%. What is the specific consumption of silver per 1 m2 of coating (excluding silver consumption due to mechanical losses of electrolysis?

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