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Chemistry 7 Online
OpenStudy (anonymous):

Please find the 3 variables: A student experiments on which is more effective in removing stains: calamansi juice or detergent. he uses ketchup on 2 clean white cloths but put them in the two solutions. he also soaks 2 litmus papers to find which is an acid or not. ^^

OpenStudy (anonymous):

please help

OpenStudy (chmvijay):

what you think the 3 variables be ?

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