45.00 mL of unknown calcium hydroxide solution is titrated with 0.450 M standard nitric acid solution. If 41.37 mL of the standard acid solution is required to reach a phenolphthalein endpoint, what is the molarity of the unknown calcium hydroxide solution
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Ответ:
0.0207 M
Explanation:
The equation of the reaction is
2HNO3(aq) + Ca(OH)2(aq)> Ca(NO3)2(aq) + 2H2O(l)
concentration of acid CA= 0.45 M
concentration of base CB = ???
Volume of acid VA = 41.47 ml
Volume of base VB = 45.00 ml
Number of mole of acid NA = 2
Number of moles of base NB=1
Given;
CAVA/CBVB =NA/NB
CAVANB =CBVBNA
CB = CAVANB/VBNA
CB= 0.45 * 41.47 * 1/45.00 *2
CB = 0.0207 M
Ответ: