100 mL of a water sample consumed 10 mL of N/50 H2SO4 during titration using phenolphthalein as an indicator. Few drops of methyl orange were added to the same solution and titration was continued. The yellow colour of the solution just turned orange after addition of another 21 mL of the same acid solution. Calculate the type and extent of alkalinity present in the water sample. What could be the disadvantages of using this water sample source in boiler