EXERCISE 30 (Continued) 

 Color or Action of Indicator 



(79) 



QUESTIONS 



What effect have the moist fingers upon litmus paper? 



Write the reaction which occurs when carbonate of lime or other bases 



in the soil are acted upon by hydrochloric acid. 

 Why does the washing of an acid soil in the presence of ammonia have a 



brown color? 

 Why is it necessary to test the subsoil as well as the surface soil? 



