Question

calculations, each correct, but unsupported answer is only wort How many kilograms of table salt must be added to 125.00 kg of water to produce p 25% by weight of salt? To solve this, rearrange the following equation: (5 points 2) How kg of water to produce pickling brine that is Pet.by wt. = - 100% (mass of solute) (mass of solute) + (mass of solvent)] 28) Concentrated hydrochloric acid is 12.1 moles per Liter of HCl in water. Assuming that the HCl is 100% ionized, what would the pH of this solution be? [4 points) 29) How many milliliters of 0.800 M potassium carbonate solution would be needed to precipitate the calcium ion from 250,0 mL of 0.640 M CaCl solution? [7 points) CaCl + K:C0, → CaCO3 + 2 KCI 30) As discussed in class, the relatively large amount of molecular oxygen in the atmosphere during Earth's ancient past gave rise to very large insects. This is a manifestation of what Law? [1 point)

Answer 1

284 25% means 25 kg salt ein lookg solution C Amount of solvent (water) = /100-250kg atsug water es 75 xg 125 kg needs 25kg salt m 25-X125 kg sallo = 41.667 kg *** Ams' 41.664 ng Salt must be added. [H+] +]It ion Corrienbatoon If acid fully dissociate then Iti] = 12 1 molas :: pH = -log £12.1] --1.0827854 Ans's ÞH -(-1.08) at -1:08

297 1(1) Cadz reacts with 1(M) K2CO3 to produce laco 3 - 250.0me of 0.640 (M) Cadz needs say ame of 0.800 M) poltassium carbonate .: 2500 ml x 0.640 (a) = xml 0.800 (my 2 .. a = 250 x0.640 0.800 2:0.200 m2 - 6.2. mod -of 0.800 (ar) KG3 is needed. 30y This is the manifestation of hyperoxia.