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17.07.2019 •
Chemistry
What volume of a 0.442 m naoh solution is needed to neutralize 65.0 ml of a 0.296 m solution of hno3?
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Ответ:
NaOH(aq) + HNO₃(aq) → NaNO₃(aq) + H₂O(l)
Molarity (M) = number of moles (mol) / Volume of the solution (L)
Molarity of HNO₃ = 0.296 M
Volume of the solution = 65.0 mL = 65.0 x 10⁻³ L
Moles of HNO₃ = Molarity x Volume of the solution
= 0.296 M x 65.0 x 10⁻³ L
= 19.24 x 10⁻³ mol
Stoichiometric ratio between NaOH and HNO₃ is 1 : 1.
Hence,
moles of NaOH = moles of HNO₃
= 19.24 x 10⁻³ mol
Molarity of NaOH = 0.442 M
Volume of NaOH = moles of NaOH / Molarity
= 19.24 x 10⁻³ mol / 0.442 M
= 0.0435 L
= 43.5 mL
Hence, the volume of needed NaOH solution is 43.5 mL.
Ответ:
Calculation
write the equation for neutralization
NaOH +HNO3 → NaNO3 +H2O
find the moles HNO3 used
moles =molarity x volume in liters
volume in liters =65/1000 =0.065 liters
molarity =0.296 m
moles = 0.065 x 0.296 = 0.01924 moles
by use of mole ratio between NaOH to HNO3 which is 1:1 the moles of NaOH is also 0.01924 moles
The volume of NaOH is = moles/ molarity
molarity =0.442 M
0.01924/0.442 = 0.0435 L or 0.0435 x1000 = 43.5 Ml
Ответ:
2) is called 2-methyl-2-butene because we have to give the double bond lowest possible number but in this case double bond in position 2 from both sides so we start from the side gives the branch number 2 not 3
3) is called 7-Ethyl-4-decyne because we have to start from the side that gives the triple bond lowest possible number which is 4 and the branch will be at position 7 (note that the name of 10 carbon is incorrectly written in the choices is called decane (as alkane) or decyne when contains triple bond)
4) is called 2,3-Dimethyl pentane because it is 5 carbons (pentane) and we have two branches of the same alkyl (dimethyl) in positions 2 and 3
5) is called 1-Butanol because it contains 4 carbons and has one OH as functional group which take the suffix -ol in position 1 so we said the name as 1-butanol (remember to give the functional group lowest possible number)
6) is called propyl butyl ether because the longest chain is 4 carbons which called butyl and the smallest chain is propyl, it also has another name 1-Propoxy butane