
Soluții. c%. Cm
Authored by Raluca Iordache
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10 questions
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1.
MULTIPLE CHOICE QUESTION
10 mins • 10 pts
Concentrația procentuală a soluție obținute prin dizolvarea a 40 g de sodă caustică în 210 g de apă este:
2.
FILL IN THE BLANK QUESTION
10 mins • 10 pts
Ce masă de acid sulfuric se găsește în 350 mL soluție de concentrație 20%, cu densitatea de 1,143 g/mL?
3.
MULTIPLE CHOICE QUESTION
1 min • 10 pts
Cristalohidratul FeSO4 ·7H2O are denumirea uzuală:
4.
FILL IN THE BLANK QUESTION
10 mins • 10 pts
Calculați concentrația procentuală a soluției obținute prin amestecarea a 200 g soluție de sare de bucătărie de c=10% cu 50 g soluție sare de bucătărie de c=20%.
5.
MULTIPLE CHOICE QUESTION
10 mins • 10 pts
Cristalohidratul clorură de bariu conține 14,74% apă de cristalizare. Formula acestui cristalohidrat este:
BaCl2*4H2O
BaCl2*6H2O
BaCl2*7H2O
BaCl2*2H2O
6.
FILL IN THE BLANK QUESTION
10 mins • 10 pts
Solubilitatea clorurii de amoniu în apă la 00 C este 29,4 g, iar la 500 C este 50,4 g. Să se calculeze masa de clorură de amoniu care trebuie adăugată la 500 g de soluție saturată de clorură de amoniu la 0 0 C, pentru ca să devină saturată la 500 C.
7.
MULTIPLE CHOICE QUESTION
10 mins • 10 pts
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