in the given figure OA=OB and OD =OC . Then, angle OAD = ?
Answers
Step-by-step explanation:
The percentage by mass of calcium carbonate in eggshell was determined by adding excess hydrochloric acid to ensure that all the calcium carbonate had reacted. The excess acid left was then titrated with aqueous sodium hydroxide. a) A student added 27.20 cm^3 of 0.200 mol dm^-3 HCl to 0.188 g of eggshell. Calculate the amount, in mol, of HCl added. b) The excess acid requires 23.80 cm^3 of 0.100 dm^-3 NaOH neutralization. Calculate the amount, in mol, of acid that is in excess. c) Determine the amount, in mol, of HCl that reacted with the calcium carbonate in the eggshell. d) State the equation for the reaction of HCl with the calcium carbonate in the eggshell. e) Determined the amount, in mol, of calcium carbonate in the sample of the eggshell. f) Calculate the mass and the percentage by mass of calcium carbonate in the eggshell sample. g) Deduce one assumption made in arriving at the percentage of calcium carbonate in the eggshell sample.
Answer:
obc
Step-by-step explanation:
because when we made an angle named oad we are left with angle obc .