A certain metal M forms a soluble nitrate salt MNO₃​. Suppose the left half-cell of a galvanic cell apparatus is filled with a 1.50M solution of MNO₃ and the right half-cell with a 1.50mM solution of the same substance. Electrodes made of M are dipped into both solutions, and a voltmeter is connected between them. The temperature of the apparatus is held constant at 25.0∘C.
Which electrode will be positive?
O Left
O Right