Student obtains the following data while standardizing  solution: What is the molarity of  reported to the correct number of significant figures? Moles of NaOH:0.00400±0.00002 mole  Volume :NaOH:23.1±0.02 ml

Significant figures in moles of NaOH is 3Significant figures in volume of NaOH is 3Because uncertainty is after second decimal point, so answer should contain only 3 significant figures molarity = No. of moles  volume of solution in litre  molarity =0.0040023.1×10-3=0.1731Rounding off to 3 significant figures