Mixtures of protic ionic liquids (PIL) and polar, protic molecular liquids (MLs) are attracting great attention. Due to the ionic nature of PILs and the role of hydrogen bonding (HB) on their structure, it can be expected that such MLs will largely affect their structure. We propose to use neutron scattering at SANDALS to explore the structure of two PILs mixed with formamide derivatives with 0, 1 and 2 amino methyl groups. The corresponding change in number of donor HB sites, together with the different ML polarities, is likely to affect PIL’s structure. These mixtures have not been explored so far, despite their potential importance, considering that the mentioned amides are widely used organic solvents and represent an interesting mimic system for peptides and PILs-based mixtures with such MLs are likely to have interesting applications in bio-related fields.