Let's eliminate the options one at a time.
A) They indeed all can donate an extra proton (or H+) so they are acidic. A is true.
B) They will not taste bitter, as acids, like those listed, will be sour. B is false
C) A pH above 7 means that something is basic, not acidic. C is false
D) Litmus paper turns blue when exposed to something basic, and red when exposed to something acidic. D is false.
The correct answer is A
Explanation:
Formula to calculate heat capacity is as follows.
= a + bT + 
where, a, b and c are constants.
Their values at 
are as follows.
a = 
b = 
c = 
Hence, putting the given values into the above formula as follows.
= a + bT +
= 
kJ/mol K
= 14.43 kJ/mol K
Thus, we can conclude that the heat capacity of crystalline calcium carbide at 49.0
is 14.43 kJ/mol K.
Answer:
[NO₃⁻ ] = 2.596 M
Explanation:
Ca(NO₃)₂ dissolves in water according to the following equation:
Ca(NO₃)₂ ⇒ Ca²⁺ + 2NO₃⁻
The moles of Ca(NO₃)₂ that dissolve is found as followed:
(21.3 g) / (164.10 g/mol) = 0.1298... mol
The number of NO₃⁻ ions are related to the above quantity by the molar ratio:
(0.1298 mol Ca(NO₃)₂) (2NO₃⁻/Ca(NO₃)₂) = 0.2596...mol NO₃⁻
The concentration of the nitrate ions is then calculated:
[NO₃⁻ ] = (0.2596...mol) / (100.0ml) x (1000mL/L) = 2.596 M
