The bond between one water molecule and another is called a hydrogen bond.  It is stronger than the bond between other polar molecules because the hydrogen 'end' of the molecule has a very small electron cloud and is a positive pole of the molecule which forms a strong attraction to the negative end of a neighboring … Read more
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The molar mass of KCl is 74.6 g  multiply that by 2.45 and you get 182.8 g which is the amount you would need to make 1000 mL of solution.  Divide that by 20 to get the amount for 50 mL because 50 is 1/20 of 1000.  9.14 g is needed.
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Molar mass of K2S is 110.3 g multiply that by 2.18 and you get 240.5 g to make one liter. Your proportion is 240.5g   =      200.0 g     Divide 200.0 by 240.5 = 0.832 liters    1 liter   x
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It has a low molecular mass: 17  and weaker intermolecular hydrogen bonds than water which is a liquid at room temperature while NH3 is a gas.
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Na2CO3   +   2 HCl  -->  2 NaCl  + H2O  + CO2 H2O  + CO2  starts out as carbonic acid-  H2CO3 -  (carbonation) and decomposes to water and carbon dioxide which is what makes the bubbles in soda.
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It means the atoms are lined up in such a way as to create a magnetic field loop that exits from one side or end of the substance and reenters at the opposite side or end.
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Chalk powder is insoluble in water so the easiest way would be to filter the mixture or just let the water evaporate.