[puddi_puddi]

hi!
i'm really sorry if this question is ridiculous. it's my first time posting so let me know if i should go elsewhere.

i did a lab today where we mixed 2g of a CaCl₂ + CaCO₃ mixture with 10mL deionized water. we put the solution through a filter and boiled the resulting filtrate. when all of the water was boiled out, there was a crusty white solid left.

i'm trying to figure out what this white solid was. i don't think there was a chemical change (there was no fizzing/bubbling, color change, effervescence, or immediate precipitation formation. solid only formed when the water turned into vapor), so i think it's either CaCl₂ or CaCO₃, not a new chemical. but i could be wrong.

how do i know what it is? what are the clues?

thank you so so much!!

[puddi_puddi]

i don't mean to HURR DURR BOOST or whatever, but i think i might have found the solution! i don't know if it's correct but i think i'm onto something.

the key i think is that CaCO₃ is insoluble in water. so logically it got left behind in the filter paper at least mostly, right? which means the filtrate was (mostly) just water and CaCl₂. which means boiling off the water would leave only the CaCl₂, right?

i guess i feel unsure because the CaCl₂ is all crusty and off-white instead of the chunky solid that it was before. plus, i'm having a hard time believing that all of the CaCO₃ was left behind in the filter.

i think for now though, that's the answer i'm going with. please let me know if i've made a mistake m(_ _)m

[AWK]

OK