As stated by the manufacturer this refund policy applies only to autoshipments and does not apply to the firsts months supply of any trial offers shipping all orders are shipped via the united states postal service priority mail fedex or ups standard complete with tracking and delivery information unfortunately shipping is only available via the product website to united states customers which is a major drawback for international fitness buffs all orders are shipped at the end of the next business day as stated by the companys official shipping policy packages are delivered an average of business days to any destination within the united states usps also offers delivery on saturday to a range of areas within the us united states customers are advised to contact the company .
n(HCl)/2 = n(Na2CO3)
HCl + NaOH = NaCl + H2O
n(HCl) = n(NaOH)
m(HC) = ω*m(p-pa) = 0,2*100 = 20 г.
n₁(HC) = m/M = 20г./36,5 г/моль = 0,55 моль
m(p-pa NaOH) = 1,03 г/мл * 50 мл = 51,5 г
m(NaOH) = ω*m(p-pa) = 51,5 г * 0,25 = 12,875 г.
n(NaOH) = m/M = 12,875 г. / 40 г/моль = 0,32 моль
n₂(HCl) = n(NaOH) = 0,32 моль
n₃(HCl) = 0,55 моль - 0,32 моль = 0,23 моль
n(HCl)/2 = n(Na₂CO₃) = 0,23 моль /2 = 0,115 моль
m(Na₂CO₃) = n*M = 0,115 моль * 106 г/моль =12,19 г.
ω(Na₂CO₃) = m(ω(Na₂CO₃)/m(p-pa) = 12,19 г/100 г. = 0,1219 или 12,19%