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a lake in central texas contains 5.0 billiion liters of water. the pH is normally 6.4, but it is tested at 5.6. how much CaCO3 should be added to bring the pH to a more reasonable 6.0?
a 19.3 g mixture containing sodium sulfide and calcium chloride. 86.9% sodium sulfide and 63.9% by mass chlorine. what is the grams of chlorine?
If 160 mL of wet h2 is collected over water at 24 degrees Celsius and a barometric pressure of 738 torr , how many grams of Zn have been consumed? (The vapor pressure of water is 22.38 torr.)
Calculate the final hydrogen ion concentration of a solution after 25.0 mL of 0.500 M HCl is treated with 40.0 mL of 0.0500 M Ba(OH)2(aq) and diluted to 100.0 mL.
If copper has a photoelectric threshold wavelength of 279 nm, calculate the velocity (m/s) of the electron emitted when copper is illuminated with light with a frequency of 2.33 × 1015 Hz. Express answer in scientific notation.
Write the two chemical equations that show the titration reactions of the carboxylic acid group and the amino group of glyclyglycine
draw a lewis structure of the molecule and indicate the number of bonds and orbitals used in bonding. Show electron configurations of the central bonding atom in both the unhybridized and hybridized states.
A reaction takes place with a mass defect (lost mass) of 0.030kg. How much energy does the correspond to?
A student performs an extraction using water and methylene chloride. Which is the top layer and which is
Calculate the mass of silver bromide that will produce 0.023 mol Na3[Ag(S2O3)2].Answer in units of g.
what effect could having too much compound in the capillary tube have on the observed melting point? a) the observed melting point would not change
What is the potassium concentration of a solution formed by combining 50.0 mL of 0.400 M KCl with 50.0 mL of: a) 0.100 M PdCl6, b) 0.800 M PdCl6 , c) water, d) 0.200 M PdCl6 (If The Ksp for K2PdCl6 = 6 x 10^-10)
For the reaction 2 HCl + Na2CO3 → 2 NaCl + H2O + CO2 what volume of 0.45 M HCl solution would be needed to produce 2.5 L of CO2 at STP
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